3

On earlier versions of Ubuntu, the AltF☒ and Alt shortcut keys for switching between virtual terminals seem to have been disabled under X Windows, so it wasn't possible to trigger them accidentally.

I'm now using Ubuntu 16.04 with Cinnamon desktop environment, and the shortcuts are enabled even under X Windows.

I frequently trigger them accidentally while trying to access menu items or to go forwards/backwards in a web browser.

How can I disable these virtual terminal shortcut keys, or replace them with the versions that require Ctrl (e.g. CtrlAltF1 instead of just AltF1)?

--

(I've found several older answers that suggest a custom xmodmap, but this seems to have no effect for me.)

3

For a permanent fix, you can add your modified mapping to /etc/console-setup/remap.inc.

You must run sudo dpkg-reconfigure console-setup -phigh to apply the changes and reboot.

For example, this what I use to disable alt-Fxx and alt arrow switching

# Remap alt+Fxx key to void to avoid terminal switching
alt     keycode  59 = VoidSymbol
alt     keycode  60 = VoidSymbol
alt     keycode  61 = VoidSymbol
alt     keycode  62 = VoidSymbol
alt     keycode  63 = VoidSymbol
alt     keycode  64 = VoidSymbol
alt     keycode  65 = VoidSymbol
alt     keycode  66 = VoidSymbol
alt     keycode  67 = VoidSymbol
alt     keycode  68 = VoidSymbol
# Also remove mapping for alt left arrow and right arrow
alt keycode 105 = VoidSymbol
alt keycode 106 = VoidSymbol

`

2

Try to use the command in terminal sudo kbd_mode -s and see if it helps. It changes keyboard input mode to "scancode". I had the same issue and found that this may be the solution.

  • Made my keyboard unusable on Ubuntu 19.04. – Berend de Boer Aug 23 '19 at 20:31
1

This thread at Unix stackexchange helped me figure out a temporary one-off solution:

# This command removes all the lines that look like:
#    alt keycode 123 = Console_1'
# ... with no additional modifiers
$ sudo dumpkeys | grep -Pv '^\s+alt(gr)?\s+keycode\s+\d+\s+=\s+(Console_|Incr_Console|Decr_Console)'|sudo loadkeys

It seems that Ubuntu 16.04's console-setup package stores its cached keymap at /etc/console-setup/cached.kmap.gz.

But I can't figure out what program generates this "cache" in the first place. Any ideas? All I can tell is that re-running dpkg-reconfigure console-setup console-setup-linux triggers its regeneration.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.