I am testing the latest weekly build of Qubes 4.2 and for me it works well enough to go further. I have installed the debian-11-minimal template that is available and after an update and restart of the template, I am unable to open the terminal on the template. With qvm-run I get this output:
[qubesuser@dom0 ~]$ qmv-run -u root debian-11-minimal xterm
Running ‘xterm’ on debian-11-minimal
debian-11-minimal: command failed with code: 84
[1]+ Done qvm-template-gui
Maybe try enabling security (maybe updates candidates also) in /etc/apt/sources.list.d/qubes-r4.list prior to updating?
Something like this:
# Main qubes updates repository
deb [arch=amd64] https://deb.qubes-os.org/r4.1/vm bullseye main
#deb-src https://deb.qubes-os.org/r4.1/vm bullseye main
# Qubes updates candidates repository
deb [arch=amd64] https://deb.qubes-os.org/r4.1/vm bullseye-testing main
#deb-src https://deb.qubes-os.org/r4.1/vm bullseye-testing main
# Qubes security updates testing repository
deb [arch=amd64] https://deb.qubes-os.org/r4.1/vm bullseye-securitytesting main
#deb-src https://deb.qubes-os.org/r4.1/vm bullseye-securitytesting main