WM should stop and inform about other already running WM

[atennert]

From #13: I did not notice the startlcarswm script; it would be useful if it's mentioned in the manual that that is the one to use. Anyway, I ran it and... it was not good. The system immediately went into panic mode, display settings changed, and I was notified that the system detected a problem and that I should log off. The problems persisted and I had to restart to recover. If I ignore the error messages and close the dialogs which prompt me to send an error report, I can see that the wm starts, but does not load the rest of the functionality.

[Concern4computers]

If you were already running a WM at the time you ran the startlcarsswm script, then you can rationally expect a conflict as both wm's would want control. The way to use the startlcarswm script is to log out and switch to lcarswm from the login screen. You are going to want to have a gdm, sddm or lightdm installed at the time so you can make that selection. The script, then, runs from that choice.