Hi @fxbastler,
I checked the temp there is no such file named debian10to12.log.file but there was UPDATE_FAILED I viewed that it had following logs.
> Execute apt command simulation on "update"
> Execute apt command on "update"
Hit:1 http://deb.debian.org/debian bookworm InRelease
Hit:2...
We are using 3CX self-hosted. We are trying to update V18 to V20. Our 3CX server configuration has 2 CPUs, 4 GB RAM, 20 GB storage, and 8 GB free. We are getting your 3CX Debian OS failed to update
3CX Phone System Management Console ID: 10012.