So, was curious to try Wayland. Installed and it barely worked. I uninstalled Wayland and returned to a Plasma session.

Now, when I boot up the system, I get a black screen of death with the error message: "xsession unsupported number of arguments (2) falling back to default session".

If I click the okay button the error just keeps repeating itself. I can TTY but that's all.

My entire system has been rendered useless.

Any suggestions?

Okay, I've Googled exhaustively and have found nothing helpful. I have:

1.) Checked .profile in home directory and compared to functioning system. Looks good.
2.) Checked .bashrc the same way. Looks good.
3.) Purged xorg and reinstalled.
4.) Purged SDDM and reinstalled.

So far, nothing has worked.

Seems like there ought to be a simple solution to this? Is there a script somewhere messing up Xsession?

Okay, checked xsesssion-errors. Found this?

The X11 connection broke: I/O error (code 1)
X10 fatal IO error 4 (Interrupted system call) on X server ":0"
after 116 requests (116 known processed) with 0 events remaining.
Xsession: Xsession started for vtpoet at Tue Oct 18 [etc....]
Xsession: unspported number of arguments [etc....]

Also a couple lines later (with similar syntax: IO error 11

I generally figure if I haven't gotten a response within 6 hours, as a rule of thumb, I ain't gonna. Nobody can help me.

I re-installed and am now running pure, unadulterated KDE NEON. I really liked having a blank slate to start with. Used Aptik to reinstall my fav packages. And always keep my Home folder on a separate partition., The only problem I'm having is that the Activities manager isn't remembering my key shortcuts. Appears to be a bug in the latest rendition of KDE Neon 5.8.2.