cinnamon
I'm using Ubuntu 18.04 with default Cinnamon 3.6.7.
I'm using emacs and when I press CTRL-ALT-A, Cinnamon hijacks the keys and does something weird with my terminals.
It bring them all on my current workspace, but there are also some blank ones without anything inside. Pressing again CTRL-ALT-A makes them all disappear.
I can't find what is responsible for this behavior: I've looked into Keyboard/Shortcuts, looked into Cinnamon's code on github without any luck.
I don't use Cinnamon so this might not work for you, but in vanilla Gnome 3.6 you could do this either via terminal:
gsettings set org.gnome.settings-daemon.peripherals.keyboard input-sources-switcher alt-shift-l
or via dconf-editor, navigating to org > gnome > settings-daemon > peripherals > keyboard and entering alt-shift-l as a value for the input-sources-switcher key:
In Gnome 3.8 they have re-added this feature to Settings > Keyboard > Shortcuts, via an additional section called Typing:
You can simply un-map the keys.
Run dconf-editor. Head to org.cimmamon.muffin.keybindings. And empty or change the conflicting key bindings.
I recommend you edit the keybindings in Sublime Text though.
edit
org.cinnamon.desktop.keybindings.wm
'cause
org.cinnamon.muffin.keybindings
seems to be deprecated
/edit
Best Answer
I had this issue on a brand new Linux Mint 19.1 install, I searched all possible system keybindings, to no avail - then, I found out that Ctrl-Alt-A was hijacked by Terminator, even if it was set to use Ctrl-Shift-Alt-A. Re-configuring Terminator to use a different shortcut and then restarting it did the job.