In the keyboard settings I’ve deleted the
ctrl + alt + T shortcut for the terminal, so it is not defined (Because it didn’t work most of the time). I’ve also added a new shortcut to run tilix via
ctrl + alt + R. After that I could start tilix via the new shortcut.
Now after reboot a funny thing happened: The shortcuts in the keyboard settings are still defined as I left it. However, now the tilix shortcut with
Rdoesn’t work anymore, but the combination with
T works, although it isn’t defined anymore. There seems to be another service at work. I’ll try to set the keyboard input to none as suggested.