Solved the problem by following the accepted comment on this post: https://askubuntu.com/questions/1242110/after-upgrading-to-ubuntu-20-04-lockscreen-not-working `$ sudo dpkg-reconfigure gdm3` -> Choose gdm3 Don't forget to reboot. Also, it seems the error message that the gdm service cannot be started after the reconfigure is normal.
Using lightdm instead of gdm3 is the cause of the problem here as it seems. Of course not a real fix, but a nice workaround.
Hope this helps somebody.
Solved the problem by following the accepted comment on this post: /askubuntu. com/questions/ 1242110/ after-upgrading -to-ubuntu- 20-04-lockscree n-not-working
https:/
`$ sudo dpkg-reconfigure gdm3`
-> Choose gdm3
Don't forget to reboot. Also, it seems the error message that the gdm service cannot be started after the reconfigure is normal.
Using lightdm instead of gdm3 is the cause of the problem here as it seems. Of course not a real fix, but a nice workaround.
Hope this helps somebody.