I was able to resolve this. I'm not entirely sure of the correct
sequence, but in case anyone else encounters this, I *think* it went
something like this:
$ sudo apt-get remove xorg # which also removed ubuntu-desktop
$ sudo aptitude install xserver-xorg # i rejected the first choice it gave me
t
Public bug reported:
I'm not entirely sure whether it's package updates or something I did
that caused this problem, but I'm getting this:
$ sudo aptitude dist-upgrade
The following NEW packages will be installed:
libgl1-mesa-dri{a} libllvm3.6v5{ab} libxatracker2{a} xserver-xorg{a}
xserver-x
I do not know if it will help either, but replacing "sna" with "uxa" in
/etc/X11/xorg.conf ( or creating a new file with these contents:
Section "Device"
Identifier "intel"
Driver "intel"
Option "AccelMethod" "uxa"
EndSection
) will at least make gnome-shell / unity / ...
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