Comment 2 for bug 1760371

This was a system that generally stayed on 24/7, so I am not sure what updates might have caused this to happen. The last update before the system rebooted occurred at "Start-Date: 2018-03-31 09:57:33", see attached update history file.

I should also add that I have been using lightdm along with LXDE on this system. When the error originally occurred, another failure message was "lightdm: PAM unable to dlopen(pam_kwallet.so): /lib/security/pam_kwallet.so: cannot open shared object file: No such file or directory" so I then proceeded to install libpam-kwallet4 and libpam-kwallet5 (as you can see in the install history), which made that error go away, but the lightdm startup problem persisted. I then attempted to install and use gdm, but it failed as well. I then tried lxdm and it succeeded, except that there were many applications that could not be launched once logged into the environment. I believe the problem has something to do with lightdm and gdm not being able to unlock a keyring of some sort, but I don't see libpam-kwallet4 or libpam-kwallet5 mentioned as dependency for it.