My setup is the pantheon DE (and a it's apps like files and terminal etc) installed on top of ubuntu 18.04. I've had this setup for about 6 ~ 7 months with no issues.
After a routine system update very recently, the pantheon DE options has disappeared from the list of available DE on the system and only ubuntu and ubuntu (wayland) are available.
Now i have a Frankenstein of a system with a mix of elementary and ubuntu apps and settings.
Things I've tried so far:
- reinstall elementary-desktop
- reinstall lightdm
- reinstall pantheon-greeter
Thanks for reading !