I have server with Cloudlinux 6.8 (cPanel + softaculous).
User try to update over cPanel in softaculous section : owncloud 9.0.0.19 to the latest version 9.1.10-21
When click on upgrade user gets the message:
It is not possible to Upgrade from to 9.1.1
Please upgrade to the 9.0.0 version before upgrading to 9.1.1
in this log
grep "starting upgrade" /home/username/ownclouddata/owncloud.log
I found it
8.1.30 => 8.2.0.12 (2015-10-21)
8.2.0.12 => 8.2.1.4 (2015-12-05)
8.2.1.4 => 8.2.2.2 (2016-01-15)
8.2.2.2 => 9.0.0.19 (2016-04-01)
Here I found nothing special
grep "index.live.php?act=upgrade" /usr/local/apache/logs/error_log
grep "index.live.php?act=upgrade" /usr/local/cpanel/logs/access_log
grep "index.live.php?act=upgrade" /usr/local/cpanel/logs/error_log
I checked the versions config.php and status.php
{"installed":true,"maintenance":false,"version":"9.0.0.19","versionstring":"9.0.0","edition":""}