[Bug 1508146] Re: Alt+left/right arrows switch between tty consoles (Gnome Shell vanishes), cannot disable

[Yannick]

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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https://bugs.launchpad.net/bugs/1508146

Title:
  Alt+left/right arrows switch between tty consoles (Gnome Shell
  vanishes), cannot disable

Status in console-setup package in Ubuntu:
  New
Status in gdm3 package in Ubuntu:
  Confirmed
Status in gnome-shell package in Ubuntu:
  Confirmed
Status in kubuntu-meta package in Ubuntu:
  Confirmed
Status in lightdm package in Ubuntu:
  Confirmed
Status in mutter package in Ubuntu:
  Confirmed

Bug description:
  I'm used to using alt+left/right arrow to navigate back and forward in
  web browsers and elsewhere (nautilus)...  But on this fresh install of
  Ubuntu Gnome 15.10 beta, it seems to try and switch me between tty
  consoles (the ctrl+alt+f1 ones).  But it's not listed as one of the
  shortcuts in the "keyboard" menu, so I don't know how to disable it...

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