In my case changing doesn't work when both combinations use same keys, like [Ctrl+Shift L] and [Shift+Ctrl L]
This works for me: Switch to next source = Ctrl+Shift L Switch to previous source = Ctrl+Shift R
Ubuntu 16.04.5 LTS
In my case changing doesn't work when both combinations use same keys, like [Ctrl+Shift L] and [Shift+Ctrl L]
This works for me:
Switch to next source = Ctrl+Shift L
Switch to previous source = Ctrl+Shift R
Ubuntu 16.04.5 LTS