I recently upgraded from Whonix 12 to 13. After a reboot, a login screen appears on the gateway and workstation VMs. I can't bypass this screen.
Did you follow the steps mentioned here: https://www.whonix.org/wiki/Upgrading_Whonix_12_to_Whonix_13
Have a nice day,
As explained here, please try it with the default credentials: https://forums.whonix.org/t/unknown-splash-screen-logon/2812
Thanks. The issue was resolved using apt-get install non-qubes-whonix-gateway, apt-get install non-qubes-whonix-workstation, from a virtual console.