I have a Pinebook Pro and installed Focal xfce on its eMMC. I would like to swith to i3. So I have installed `i3`, `i3status` and `i3lock` using apt. Then I have altered the `user-session` config of lightdm from `xfce` to `i3` (actually did this at three places). With all this done, I still end up in XFCE. Hints on where to look further are welcome.