@frankagricola @derula when its done
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First: thank you for a very nice software 
Searching this forum i see this problem in this thread is not new, it have happened for other users for an earlier version too.
The bug here is in your instructions, that clearly say the latest point releases should be used when migrating:
From Nextcloud - Migration guide
… Nextcloud 10.0.x as an upgrade to ownCloud 9.1.x
These are some examples of an upgrade path. The minor release (.x below) should always be the latest bugfix release.
So you (accidentally) fool admins to update ownCloud to latest point release even when it is known not to be compatible when NC point release is behind!
What it really should add is something like: the Nextcloud point release must not be lower than the ownCloud point release. Exampe: Nextcloud 10.0.5 is NOT compatible with ownCloud 9.1.6.
Please correct your migration guide ASAP before more people get fooled!
I hit this while evaluating upgrade+migration method for ownCloud in Mageia 5 to Nextcloud in Mageia 6. https://bugs.mageia.org/show_bug.cgi?id=21066#c7 ( which i am trying to make nice at https://wiki.mageia.org/en/OwnCloud#IMPORTANT_:_.2ABEFORE.2A_upgrading_to_Mageia_6_.21 - improvements and corrections are welcome, BTW )
Sincerely /Morgan
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Hi @Morgano please report this on the appropriate issue tracker https://github.com/nextcloud/nextcloud.com 
Instruction: https://github.com/nextcloud/server/issues/5426 (first issued as https://github.com/nextcloud/nextcloud.com/issues/496 )
Script: https://github.com/nextcloud/server/issues/5425 (first issued as https://github.com/nextcloud/nextcloud.com/issues/497 )
@Morgano thanks for filing the issues. The Nextcloud updater should ignore minor versions (the .5 vs .6) on migration between different products (oC to Nc), but apparently something is wrong. It might be that oC didn’t properly set the vendor on install or update, there was a bug with that. Once 10.0.6 is out it should of course work but this isn’t nice so we have to look if we can work around it…
A work-around from this blog is to set the version of your ownCloud server to 9.1.5.1, see:
https://0xstubs.org/migrating-from-owncloud-9-1-6-to-nextcloud-10/
edit your config/config.php and set version to 9.1.5.1 or lower.
From @nickvergessen - if the reason is that oC didn’t set the vendor properly, you should run this before you try to upgrade to Nextcloud:
occ config:app:set --value "owncloud" core vendor
Reading from posts earlier in this thread, and other places, I am told that OC 9.1.6 use a newer engine than OC 9.1.5 and NC 10.0.5, so that is not a safe path anyhow. Or is there news on that?
It do seem to work for some anyhow, but i am trying to define an official upgrade path for Mageia 5 (owncloud) to Mageia 6 (nextcloud) that is doable ASAP. https://bugs.mageia.org/show_bug.cgi?id=20953#c21 , https://wiki.mageia.org/en/OwnCloud#IMPORTANT_:_.2ABEFORE.2A_upgrading_to_Mageia_6_.21
It there any idea yet when NC 10.0.6 (or other compatible NC) is out: like in a week, or four weeks?
If soon, maybe we can get NC 10.0.6 into Mageia5 backports
I agree with the assesment from the blog on Migrating from ownCloud 9.1.6 to Nextcloud 10 – 0xStubs that there don’t seem to be any changes to the database, which would indeed be unlikely in such a late-in-the-series bugfix. This should not cause any problems.
However, I’m testing this myself now with a fresh 9.1.6 and will try to fix this out. Will get back to you all.
Many thanks 
If the workaround is safe, it will save a lot of people some work.
In my case, I had to set version 9.1.5.1 in file version.php. When I set config/config.php, the updater still recognize installed owncloud version as 9.1.6.
In the end, migration from owncloud 9.1.6 (faking it as a 9.1.5.1 version) to nextcloud 10 to nextcloud 11 went well.
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FYI - https://github.com/nextcloud/owncloud-web-migrator/issues/1
I modified version.php to refer to 9.1.5.1 which worked for me but didn’t work for a user on twitter. We have to fix the migration script… The upgrade itself, if you manually replace the files that is, does work.
Thanks, jospoortvliet
I see you fixed the migration information 
The updater script issue Migration script may download incompatible Nextcloud version · Issue #5425 · nextcloud/server · GitHub got closed now with “There is a patch in the repo for this already.”
The documentation issue https://github.com/nextcloud/server/issues/5426 erroneoulsy got closed as a duplicate of above, while it should be closed fixed, as i now see at Nextcloud - Migration guide :
Note that ownCloud 9.1.6 breaks easy upgrading to Nextcloud 10.0.5. We will fix this in 10.0.6! Similar, ownCloud 10.0.2 and 10.0.3 can’t yet be upgraded to Nextcloud 12, which will be fixed with Nextcloud 12.0.1. We want to make sure we properly test the upgrade paths!
As always there may be further issues too… Just run into this theming bug https://github.com/nextcloud/server/issues/4987 on 11 something to 12.0.0 upgrade
Nextcloud 10.0.6 is available since August 7th. But:
- Migration script still detects 10.0.5 NC version to be the upgrade path for my 9.1.6 OC instance.
- Migration instruction still state that 10.0.6 will fix the issue
What’s the status then?
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seems like the update server tells the migration script what to do:
url from updater log: https://updates.nextcloud.org/owncloud-migration/?version=9x1x6x2xxxstablexx2017-05-30T17%3A13%3A25%2B00%3A00+0e399c6378c925c6859b4412dd142a862db1544ex5x6x30
outputs:
<?xml version="1.0" encoding="UTF-8"?>
<nextcloud>
<version>9.1.58.2</version>
<versionstring>Nextcloud 10.0.5</versionstring>
<url>https://download.nextcloud.com/server/releases/nextcloud-10.0.5.zip</url>
<web>https://docs.nextcloud.org/server/10/admin_manual/maintenance/manual_upgrade.html</web>
<autoupdater>1</autoupdater>
<signature>WuAMs8EGo8FD9ETw+TkeMAv8XjDv45/wiq/AAXBX8PuvJORdLhqyy2KwUiR/ztWZ
DUpINgFm110o4J4kghZTGYGhgFr0iVJ07pwVnDXC1NGGz8UdVFPPp1vJbmAiLFGB
IVnydDmx+PWI6ECcktUw5W9QRFmIc67bNoKlUXJi5XT6cLQNQnH2mAingNC5ya0T
qvqPmHIzwVu1gafxHtJfc4ZPcc6dLoAQdu9WLcIqALqd/1DEASNkZD06LVJvuWIB
HFjQtul/3pj4bC2zhX0QiubBfa3n2bA9Hq8nRVj0MLRezT0FS0ObhL4C16xT6/nE
oMp/buXZlLjkgI1RLwWvTg==</signature>
</nextcloud>Any update? Migration is still broke.
+1
Migration tool report
Current version is 9.1.6.
Migration to Nextcloud 10.0.5 available.
Following file will be downloaded automatically: https://download.nextcloud.com/server/releases/nextcloud-10.0.5.zip
Can’t continue migration … Nextcloud 10.0.6 is needed during migration … and is available for download
Nobody there to correct the migration process … ???
Thanks
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