Update with WebUpdater Nextcloud 15 to 16.0.5 does not work

We are trying to update Nextcloud 15 to version 16 using the web updater, because its on a hosted system without shell access.

We always get the error:
“Es ist ein Fehler aufgetreten”

The detailed log shows:

Aktualisierung auf 16.0.5

Es ist ein Fehler aufgetreten.

Detaillierte Protokollmeldungen

Update vorbereiten

Log-Level auf “debug” gesetzt

Wartungsmodus eingeschaltet

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Reparaturschritt: Repair SQLite autoincrement

Reparaturschritt: Copy data from accounts table when migrating from ownCloud

Reparaturschritt: Drop account terms table when migrating from ownCloud

Das Datenbankschema wird aktualisiert

Datenbank aktualisiert

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Suche nach einer Aktualisierung für die App “files” im App-Store

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Suche nach einer Aktualisierung für die App “files_pdfviewer” im App-Store

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Suche nach einer Aktualisierung für die App “files_rightclick” im App-Store

App-Store auf Aktualisierung für die App “files_rightclick” geprüft

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App-Store auf Aktualisierung für die App “files_trashbin” geprüft

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Reparaturinformation: 0 tags of deleted users have been removed.

Reparaturinformation: 0 tags for delete files have been removed.

Reparaturinformation: 0 tag entries for deleted tags have been removed.

Reparaturinformation: 0 tags with no entries have been removed.

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Reparaturschritt: Clear frontend caches

Reparaturinformation: Image cache cleared

Reparaturinformation: SCSS cache cleared

Reparaturinformation: JS cache cleared

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Reparaturschritt: Add preview background cleanup job

Reparaturschritt: Queue a one-time job to cleanup old backups of the updater

Reparaturschritt: Repair pending cron jobs

Reparaturinformation: No need to repair pending cron jobs.

Reparaturschritt: Extract the vcard uid and store it in the db

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Reparaturschritt: Cleanup cypress files from viewer app

Es ist ein Fehler aufgetreten.

I tried it a few times, I increased the phph memory-size to 512M, but nothing helped.

Please help, if anybody has an idea.
Thanks.

Fishing in the dark is the wrong way to investigate further. You first have to check the Nextcloud log file and also the web servers log file to find related errors which might point to the root cause of the problem. I don’t know how this can be done, because you haven’t really provided valuable information about your environment. Eventually your hoster can assist you getting that information.

Yes you are right, sorry.

The Nextcloud logs I can already provide, the apache logs had been deactivated by the provider and will be reactivated again tomorrow morning.
Maybe from the nextcloud log something can be seen already.

I can not see any error in it, but an excerpt is:
(I have to find out how to provide a file here)

{"reqId":"XalsID@lJeJjDWXDYv8@TgAJAgA","level":3,"time":"2019-10-18T07:39:12+00:00","remoteAddr":"","user":"--","app":"jsresourceloader","method":"GET","url":"\/index.php\/","message":"Could not find resource js\/config.js to load","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsID@lJeJjDWXDYv8@TgAJAgA","level":3,"time":"2019-10-18T07:39:12+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"GET","url":"\/index.php\/","message":{"Exception":"Symfony\\Component\\Routing\\Exception\\RouteNotFoundException","Message":"Unable to generate a URL for the named route \"theming.Theming.getImage\" as such route does not exist.","Code":0,"Trace":[{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/Route\/Router.php","line":337,"function":"generate","class":"Symfony\\Component\\Routing\\Generator\\UrlGenerator","type":"->","args":["theming.Theming.getImage",{"key":"logo","useSvg":true,"v":"1"},1]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/URLGenerator.php","line":79,"function":"generate","class":"OC\\Route\\Router","type":"->","args":["theming.Theming.getImage",{"key":"logo","useSvg":true,"v":"1"}]},{"file":"\/kunden\/xxx\/nextcloud\/apps\/theming\/lib\/ThemingDefaults.php","line":241,"function":"linkToRoute","class":"OC\\URLGenerator","type":"->","args":["theming.Theming.getImage",{"key":"logo","useSvg":true,"v":"1"}]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/public\/Defaults.php","line":187,"function":"getLogo","class":"OCA\\Theming\\ThemingDefaults","type":"->","args":[true]},{"file":"\/kunden\/xxx\/nextcloud\/core\/templates\/layout.guest.php","line":42,"function":"getLogo","class":"OCP\\Defaults","type":"->","args":[]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/Template\/Base.php","line":178,"args":["\/kunden\/xxx\/nextcloud\/core\/templates\/layout.guest.php"],"function":"include"},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/Template\/Base.php","line":150,"function":"load","class":"OC\\Template\\Base","type":"->","args":["\/kunden\/xxx\/nextcloud\/core\/templates\/layout.guest.php",null]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/legacy\/template.php","line":180,"function":"fetchPage","class":"OC\\Template\\Base","type":"->","args":[null]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/legacy\/template.php","line":211,"function":"fetchPage","class":"OC_Template","type":"->","args":[null]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/Template\/Base.php","line":131,"function":"fetchPage","class":"OC_Template","type":"->","args":[]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/base.php","line":399,"function":"printPage","class":"OC\\Template\\Base","type":"->","args":[]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/base.php","line":930,"function":"printUpgradePage","class":"OC","type":"::","args":[{"__class__":"OC\\SystemConfig"}]},{"file":"\/kunden\/xxx\/nextcloud\/index.php","line":42,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"\/kunden\/xxx\/nextcloud\/3rdparty\/symfony\/routing\/Generator\/UrlGenerator.php","Line":130,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYB@FYLf7zS-Fc@1TvQAExAQ","level":3,"time":"2019-10-18T07:40:16+00:00","remoteAddr":"","user":"--","app":"jsresourceloader","method":"GET","url":"\/index.php\/","message":"Could not find resource js\/config.js to load","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYB@FYLf7zS-Fc@1TvQAExAQ","level":3,"time":"2019-10-18T07:40:16+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"GET","url":"\/index.php\/","message":{"Exception":"Symfony\\Component\\Routing\\Exception\\RouteNotFoundException","Message":"Unable to generate a URL for the named route \"theming.Theming.getImage\" as such route does not exist.","Code":0,"Trace":[{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/Route\/Router.php","line":337,"function":"generate","class":"Symfony\\Component\\Routing\\Generator\\UrlGenerator","type":"->","args":["theming.Theming.getImage",{"key":"logo","useSvg":true,"v":"1"},1]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/URLGenerator.php","line":79,"function":"generate","class":"OC\\Route\\Router","type":"->","args":["theming.Theming.getImage",{"key":"logo","useSvg":true,"v":"1"}]},{"file":"\/kunden\/xxx\/nextcloud\/apps\/theming\/lib\/ThemingDefaults.php","line":241,"function":"linkToRoute","class":"OC\\URLGenerator","type":"->","args":["theming.Theming.getImage",{"key":"logo","useSvg":true,"v":"1"}]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/public\/Defaults.php","line":187,"function":"getLogo","class":"OCA\\Theming\\ThemingDefaults","type":"->","args":[true]},{"file":"\/kunden\/xxx\/nextcloud\/core\/templates\/layout.guest.php","line":42,"function":"getLogo","class":"OCP\\Defaults","type":"->","args":[]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/Template\/Base.php","line":178,"args":["\/kunden\/xxx\/nextcloud\/core\/templates\/layout.guest.php"],"function":"include"},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/Template\/Base.php","line":150,"function":"load","class":"OC\\Template\\Base","type":"->","args":["\/kunden\/xxx\/nextcloud\/core\/templates\/layout.guest.php",null]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/legacy\/template.php","line":180,"function":"fetchPage","class":"OC\\Template\\Base","type":"->","args":[null]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/legacy\/template.php","line":211,"function":"fetchPage","class":"OC_Template","type":"->","args":[null]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/private\/Template\/Base.php","line":131,"function":"fetchPage","class":"OC_Template","type":"->","args":[]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/base.php","line":399,"function":"printPage","class":"OC\\Template\\Base","type":"->","args":[]},{"file":"\/kunden\/xxx\/nextcloud\/lib\/base.php","line":930,"function":"printUpgradePage","class":"OC","type":"::","args":[{"__class__":"OC\\SystemConfig"}]},{"file":"\/kunden\/xxx\/nextcloud\/index.php","line":42,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"\/kunden\/xxx\/nextcloud\/3rdparty\/symfony\/routing\/Generator\/UrlGenerator.php","Line":130,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:19+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Updater::setDebugLogLevel: Set log level to debug","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}

{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Clear frontend caches","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::info: Repair info: Image cache cleared","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":0,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"SCSSCacher: css cache cleared!","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::info: Repair info: SCSS cache cleared","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::info: Repair info: JS cache cleared","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Clear every generated avatar on major updates","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Add preview background cleanup job","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Queue a one-time job to cleanup old backups of the updater","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Repair pending cron jobs","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::info: Repair info: No need to repair pending cron jobs.","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Extract the vcard uid and store it in the db","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Cleanup invalid photocache files for carddav","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Add background job to cleanup login flow v2 tokens","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Remove potentially over exposing share links","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::info: Repair info: No need to remove link shares.","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Clear access cache of projects","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:20+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Repair::step: Repair step: Cleanup cypress files from viewer app","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
{"reqId":"XalsYx@FYLf7zS-Fc@1TyQAExAE","level":1,"time":"2019-10-18T07:40:33+00:00","remoteAddr":"","user":"--","app":"updater","method":"GET","url":"\/core\/ajax\/update.php?requesttoken=MZODsI3qyN7TWKqgVgXY73J%2FLFmqWgAmB5euA8exFgA%3D%3AaPyo%2FO%2FThI2JLYGVZ3G92BkLHBfSHXZgVafPcq%2FTVW4%3D","message":"\\OC\\Updater::startCheckCodeIntegrity: Starting code integrity check...","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko\/20100101 Firefox\/69.0","version":"15.0.12.1"}
------------------------------

The log file contents can better be read, if you put a line with three ``` in front and behind each of the logs :wink:

So here is the Apache log. But it looks not really very promising to find anything.

Please help on how to do next steps to find the problem??
We need the installation.

Is there a way to install the V16 and then put the data/configuration back into place? If that is easier.

Here the apache log:

<IP> - - [18/Oct/2019:07:08:34 +0200] "GET /index.php/csrftoken HTTP/1.1" 503 10633 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:07:20:34 +0200] "GET /index.php/csrftoken HTTP/1.1" 503 10633 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:07:32:34 +0200] "GET /index.php/csrftoken HTTP/1.1" 503 10633 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:07:44:34 +0200] "GET /index.php/csrftoken HTTP/1.1" 503 10633 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:07:56:34 +0200] "GET /index.php/csrftoken HTTP/1.1" 503 10633 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP2> - - [18/Oct/2019:08:04:01 +0200] "GET /core/img/favicon-touch.png HTTP/2.0" 200 3193 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP2> - - [18/Oct/2019:08:04:02 +0200] "GET /favicon.ico HTTP/2.0" 503 8361 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:08:34 +0200] "GET /index.php/csrftoken HTTP/1.1" 503 10633 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:20:34 +0200] "GET /index.php/csrftoken HTTP/1.1" 503 10633 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:32:34 +0200] "GET /index.php/csrftoken HTTP/1.1" 503 10662 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:44:34 +0200] "GET /index.php/csrftoken HTTP/1.1" 503 10633 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /index.php/login HTTP/2.0" 503 8413 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /core/search/js/search.js?v=7b045afe-1 HTTP/2.0" 200 5652 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /core/js/files/fileinfo.js?v=7b045afe-1 HTTP/2.0" 200 2206 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /core/js/maintenance-check.js?v=7b045afe-1 HTTP/2.0" 200 548 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /core/img/logo/logo.svg?v=03452a5a6f72701b04904ffa8bcbb3ac3350fb04 HTTP/2.0" 200 387 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /core/search/js/searchprovider.js?v=7b045afe-1 HTTP/2.0" 200 12679 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /core/css/guest.css?v=7b045afe-1 HTTP/2.0" 200 21401 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /core/l10n/de.js?v=7b045afe-1 HTTP/2.0" 200 56448 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /core/js/files/client.js?v=7b045afe-1 HTTP/2.0" 200 23882 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /core/js/dist/main.js?v=7b045afe-1 HTTP/2.0" 200 1228471 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:47 +0200] "GET /index.php/js/core/merged-template-prepend.js?v=7b045afe-1 HTTP/2.0" 200 23798 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:48 +0200] "GET /core/img/logo/logo.svg?v=1 HTTP/2.0" 200 398 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:48 +0200] "GET /core/fonts/Nunito-Regular.woff2 HTTP/2.0" 200 19675 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:48 +0200] "GET /core/fonts/Nunito-Bold.woff2 HTTP/2.0" 200 19813 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:49:48 +0200] "GET /core/img/actions/error-white.svg?v=1 HTTP/2.0" 200 0 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"
<IP> - - [18/Oct/2019:08:50:08 +0200] "GET /status.php HTTP/2.0" 200 751 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0"