sudo omv-update appears to work okay. I am posting this more as FYI in case this might be part of an underlying issue. Also, looking in /tmp/ right after the update - none of indicated files exist.
Linux omv 5.14.0-0.bpo.2-amd64 #1 SMP Debian 5.14.9-2~bpo11+1 (2021-10-10) x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Tue Oct 26 15:43:21 2021 from 192.168.86.202
sistum@omv:~$ sudo omv-update
[sudo] password for sistum:
WARNING: omv-update is deprecated, please use omv-upgrade instead.
Get:1 file:/var/cache/openmediavault/archives InRelease
Ign:1 file:/var/cache/openmediavault/archives InRelease
Get:2 file:/var/cache/openmediavault/archives Release
Ign:2 file:/var/cache/openmediavault/archives Release
Get:3 file:/var/cache/openmediavault/archives Packages
Ign:3 file:/var/cache/openmediavault/archives Packages
Get:4 file:/var/cache/openmediavault/archives Translation-en
Ign:4 file:/var/cache/openmediavault/archives Translation-en
Get:3 file:/var/cache/openmediavault/archives Packages
Ign:3 file:/var/cache/openmediavault/archives Packages
Get:4 file:/var/cache/openmediavault/archives Translation-en
Ign:4 file:/var/cache/openmediavault/archives Translation-en
Get:3 file:/var/cache/openmediavault/archives Packages
Ign:3 file:/var/cache/openmediavault/archives Packages
Get:4 file:/var/cache/openmediavault/archives Translation-en
Ign:4 file:/var/cache/openmediavault/archives Translation-en
Get:3 file:/var/cache/openmediavault/archives Packages
Ign:3 file:/var/cache/openmediavault/archives Packages
Get:4 file:/var/cache/openmediavault/archives Translation-en
Ign:4 file:/var/cache/openmediavault/archives Translation-en
Get:3 file:/var/cache/openmediavault/archives Packages
Ign:3 file:/var/cache/openmediavault/archives Packages
Get:4 file:/var/cache/openmediavault/archives Translation-en
Ign:4 file:/var/cache/openmediavault/archives Translation-en
Get:3 file:/var/cache/openmediavault/archives Packages
Ign:3 file:/var/cache/openmediavault/archives Packages
Get:4 file:/var/cache/openmediavault/archives Translation-en
Ign:4 file:/var/cache/openmediavault/archives Translation-en
Get:3 file:/var/cache/openmediavault/archives Packages
Get:4 file:/var/cache/openmediavault/archives Translation-en
Ign:4 file:/var/cache/openmediavault/archives Translation-en
Get:5 http://security.debian.org/debian-security bullseye-security InRelease [44.1 kB]
Hit:6 http://deb.debian.org/debian bullseye InRelease
Get:7 http://deb.debian.org/debian bullseye-updates InRelease [39.4 kB]
Hit:8 http://linux.teamviewer.com/deb stable InRelease
Get:9 https://openmediavault-plugin-developers.github.io/packages/debian shaitan InRelease [3922 B]
Hit:10 https://openmediavault.github.io/packages shaitan InRelease
Get:11 http://httpredir.debian.org/debian bullseye-backports InRelease [42.1 kB]
Get:12 https://download.docker.com/linux/debian bullseye InRelease [43.3 kB]
Hit:13 http://packages.openmediavault.org/public shaitan InRelease
Fetched 173 kB in 2s (103 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
collectd collectd-core openmediavault tzdata
4 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/4049 kB of archives.
After this operation, 19.5 kB of additional disk space will be used.
apt-listchanges: Reading changelogs...
Preconfiguring packages ...
(Reading database ... 44941 files and directories currently installed.)
Preparing to unpack .../tzdata_2021a-1+deb11u2_all.deb ...
Unpacking tzdata (2021a-1+deb11u2) over (2021a-1+deb11u1) ...
Preparing to unpack .../collectd_5.12.0-7.1_amd64.deb ...
Unpacking collectd (5.12.0-7.1) over (5.12.0-7) ...
Preparing to unpack .../collectd-core_5.12.0-7.1_amd64.deb ...
Unpacking collectd-core (5.12.0-7.1) over (5.12.0-7) ...
Preparing to unpack .../openmediavault_6.0-29_all.deb ...
Unpacking openmediavault (6.0-29) over (6.0-28) ...
Setting up collectd-core (5.12.0-7.1) ...
Setting up collectd (5.12.0-7.1) ...
Setting up tzdata (2021a-1+deb11u2) ...
Current default time zone: 'Etc/UTC'
Local time is now: Wed Oct 27 15:34:27 UTC 2021.
Universal Time is now: Wed Oct 27 15:34:27 UTC 2021.
Run 'dpkg-reconfigure tzdata' if you wish to change it.
Setting up openmediavault (6.0-29) ...
Creating configuration database ...
Migrating configuration database ...
Running migration conf_6.0.0
INFO: The node 'homesenable' already exists at XPath '/config/services/ftp'.
INFO: The node 'comment' already exists at XPath '/config/system/fstab/mntent'.
INFO: The node 'usagewarnthreshold' already exists at XPath '/config/system/fstab/mntent'.
Setting up Salt environment ...
[ERROR ] Command '/usr/bin/patch' failed with return code: 1
[ERROR ] stdout: patching file /tmp/__salt.tmp.cw_jfasd (read from /lib/python3/dist-packages/salt/modules/network.py)
Reversed (or previously applied) patch detected! Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file /tmp/__salt.tmp.sco9bw9k
[ERROR ] retcode: 1
[ERROR ] Command '/usr/bin/patch' failed with return code: 1
[ERROR ] stdout: patching file /tmp/__salt.tmp.cwbmvo3l (read from /lib/python3/dist-packages/salt/fileserver/roots.py)
Reversed (or previously applied) patch detected! Skipping patch.
2 out of 2 hunks ignored -- saving rejects to file /tmp/__salt.tmp.d_lgzhtx
[ERROR ] retcode: 1
Processing system modifications ...
Processing triggers for man-db (2.9.4-2) ...
Processing triggers for rsyslog (8.2102.0-2) ...
Processing triggers for openmediavault (6.0-29) ...
Restarting engine daemon ...
Updating workbench configuration files ...
