dconf-editor, if you have already tried the
xmodmap way, tried this one ... it's superior because the xmodmap will fail (and need to be rerun) after you change the keyboard layout, furthermore, it has no currently reliable way to start it on login or after boot.
So, let's get started, if you don't have one:
sudo apt install dconf-editor
Open it up, and see the
org.gnome.desktop.input-sources.xkb-options, you might see
 for now, but update it to
You should see the effect immediately.
Furthermore, you might have problem with
alt+tab (now currently is
ctrl+tab), if you want to change to
ctrl+tab, just to keep it matched with the physical
alt, read on.
Change Alt + Tab to Ctrl + Tab
It turns out even you have the
unity-tweak-tool it's not at all straightforward to change this, because the tool won't allow you to bind
ctrl+tab actually it won't allow even
alt+tab, I think it's a bug or the app has no privilege to intercept the
So, another way is through the
compizconfig-settings-manager, if you don't have it just install.
In it, you should find the Ubuntu Unity Plugin section, go to Switcher.
Now update it to be as follows, see the Key to start the switcher is now set to
If you want to also change the shortcut for switching windows in the same app (which default is alt + grave accent), you may change it now with the Key to flip through windows in the Switcher set it to control + grave accent instead.