Today I did a clean install of the new Ubuntu 20.04 Focal Fossa. Since then I can no longer mount folders on my NAS, which was possible on 18.04 and on Windows.
It's exactly the same issue as this one: Ubuntu 20.04 Focal Fossa (development branch) Nautilus can't mount a NAS That issue got closed for being off-topic because 20.04 was not a stable release back then. It is now, so I guess it is on-topic now?
The German message posted in that Question is
Failed to mount Windows share: Software caused connection abort in the English version.
Things I tried so far:
- downgrading samba
client min protocol = COREto
client min protocol = SMB3and
client max protocol = SMB3to
None of these seemed to fix the issue.