In my case, I traced the issue to the keyboard-configuration package
postinst script, which ends up calling 'setupcon --force --save' which
in turn calls 'kbd_mode -u'
To reproduce:
sudo apt install --reinstall keyboard-configuration
setupcon documentation states:
"--force Do not check whether we are on the console. Notice that you can be
forced to hard-reboot your computer if you run setupcon with this option and
the screen is controlled by a X server."
It looks like the checks to avoid this behavior while a graphic
environment is active don't work in the context of the installer.
** Also affects: console-setup (Ubuntu)
Importance: Undecided
Status: New
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Desktop Bugs, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/1508146
Title:
Alt+left/right arrows switch between tty consoles (Gnome Shell
vanishes), cannot disable
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