I use GNOME Classic. There is no Ctrl+Alt+Left/Right shortcut in System Settings -> Keyboard -> Shortcuts.
It should be configured somewhere else. But where?
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In my system, those configs are available in System Settings -> Keyboard. Please double-check.
If those aren't available, you can try add them with
gconf-editor. If you use Metacity, simply go to
/apps/metacity/global_keybindings and add the corresponding values:
If you use Compiz, you can follow the steps provided by @ams
Finally, in Ubuntu 22/04 this can be disabled using
System Settings ->
View and Customize Shortcuts ->
Navigation. In there, find
Move to workspace on the left and
Move to workspace on the left, click on each entry and re-assign
Super+Page Up and
Super+Page Down respectively. This will disable any other assigned shortcuts.
on ubuntu 22:
whenever i was pressing ctrl alt left/right my workspace would move.
However, in the keyboards settings I did not have such a shortcut set but i had one for each:
a. Move workspace on the left ; shortcut: ctrl + alt + up (wtf)
b.Move workspace on the right: ctrl + alt + down (wtf again)
when i disabled the above two ctrl+alt+left/right stopped working as well.
.. quite interesting one might add ...