Update freeze: Could not open input file: occ

[gas85]

@schmunzelhummel

My nextcloud/data folder just contains 2 files

Thats strange… Basically this is where your data saved.
But based on this:

@schmunzelhummel

Inside nextcloud:

/var/www/nextcloud $ ls -l
insgesamt 36
drwxr-xr-x 5 www-data www-data 4096 Jan 12 17:01 apps
drwxr-xr-x 2 www-data www-data 4096 Jan 15 22:31 config
drwxr-xr-x 2 www-data www-data 4096 Jun 14 2018 data
-rw-r–r-- 1 www-data www-data 57 Jan 12 17:01 index.php
-rw-r–r-- 1 www-data www-data 57 Jan 12 17:01 public.php
-rw-r–r-- 1 www-data www-data 57 Jan 12 17:01 remote.php
-rw-r–r-- 1 www-data www-data 57 Jan 12 17:01 status.php
drwxr-xr-x 2 www-data www-data 4096 Jan 12 17:01 themes
drwxr-xr-x 2 www-data www-data 4096 Apr 26 2018 updater

It looks like your clean up step (that is basically number 9) has the same issue that I mentioned here:

Update Nextcloud 14: Backup timeout will start upgrade from the scratch

But you have not folder updater-xxxxx inside of the data folder. Could you please check if you did not rejected your data folder, just check your config.php (run inside of NC folder) to see where your data folder is:

grep datadirectory config/config.php
'datadirectory' => '/var/www/nextcloud/data',