what should be the first line of defense? Timeshift?
This happened after I installed AUR package masterpdfeditor and 2 applications from github (some hashing algorithm programs, in the realm of quantum-proof cryptography (Lattice-based, e.g.) I cannot find the exact github pages anymore… But they looked trustworthy. (One of them was provided by NIST.)
If using GUI: I login, black screen for few seconds, then back at login screen.
If going to ctrl+alt+f2, login successful, then startx, see picture provided.
I tried adding a new user, but result is the same.
How did you go about installing the other two packages from git? Do you know what directory they were first cloned to? Did you build from source or run an executable like an appimage? Did any of these actions occur prior to the install of masterpdfeditor?