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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 23.0.3.2
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): 2.4
PHP version (eg, 7.4): 7.4
The issue you are facing:
I did an upgrade via the web gui, which used to always work (I went through idk 5 major versions with this?). It failed at one step (I can’t recall which, also didn’t copy the error, it was something with a 403). I reloaded, assuming I could just rerun it, and now the whole page shows “Update in process.” at every URL.
It did a backup at the beginning of the upgrade process. How do I restore this backup? Where do I find it?
Is this the first time you’ve seen this error? Y:
Steps to replicate it:
- upgrade via web gui (I can’t recall which minor version to which minor version, and no way to find out in retrospect)
The output of your Nextcloud log in Admin > Logging:
Can't access anymore, the only thing I get back on the whole page is: Update in process.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '(hidden)',
'passwordsalt' => '(hidden)',
'secret' => '(hidden)',
'trusted_domains' =>
array (
0 => '(hidden)',
1 => '(hidden)',
2 => 'localhost',
3 => '(hidden)',
4 => '(hidden)',
5 => '127.0.0.1',
),
'datadirectory' => '/home/df/nextcloud_data/',
'overwrite.cli.url' => '(hidden)',
'htaccess.RewriteBase' => '/',
'dbtype' => 'mysql',
'version' => '23.0.3.2',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => '(hidden)',
'dbpassword' => '(hidden)',
'installed' => true,
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'appstoreenabled' => true,
'appstoreurl' => 'https://api.nextcloud.com/v1',
'mail_from_address' => '(hidden)',
'mail_smtpmode' => 'smtp',
'mail_smtpauthtype' => 'LOGIN',
'mail_domain' => '(hidden)',
'mail_smtpsecure' => 'ssl',
'mail_smtpauth' => 1,
'mail_smtphost' => '(hidden)',
'mail_smtpport' => '465',
'mail_smtpname' => '(hidden)',
'mail_smtppassword' => '(hidden)',
'enable_previews' => 'false',
'redis.sock' => '/var/run/redis/redis-server.sock',
'onlyoffice' =>
array (
'verify_peer_off' => true,
),
'app_install_overwrite' =>
array (
0 => 'occweb',
1 => 'deck',
2 => 'cospend',
),
'updater.release.channel' => 'stable',
'memcache.local' => '\\OC\\Memcache\\APCu',
'updater.secret' => '(hidden)',
'apps_paths' =>
array (
0 =>
array (
'path' => '/home/df/apache/nextcloud/apps',
'url' => '/apps',
'writable' => true,
),
),
);
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
find and locate can't find that file, it's not in /var/www/ – where could it be?
Is there any way to restart/continue the updater? I tried with occ but this fails because it expects a new version somewhere.