Stopped Screensaver as requested
Updated from 19 to 19.1
Restart
Can't find Cinnamon warning!!
OMG
Panic
Resolution (For me at least)
Started Linux in recovery mode
Started Network Services
Dropped to Cmd Shell
Entered apt update && sudo apt install cinnamon
Follow y/n instructions
Exit
Continue normal normal boot
Hope this helps someone out of the hole I found myself in
