[Bug 1576500] Re: Plasma fails to load: "all shell packages missing"

[Tom Kidman]

I have very similar issues to those reported here.  Upgraded to 16.04
from 15.10 (from australia - au.archive.ubuntu.com seemed flakey when I
started, but got there after a few days of trying). Couldn't start
plasma, could only get to a terminal prompt. Running startx yielded the
exact screen grabs that dpeets attached.

>From there I purged nvidia drivers and somehow got to the plasma log in
screen.  No progress after hitting enter on the log in screen.  By some
accident I plugged an HDMI cable into my laptop, and then plasma loaded.
I've verfified this a number of times.  plasma only starts fully when an
hdmi cable is connected to an external display!

I tried purging snapd (I have no idea what that is) but no difference.  I also have the weird double '//' in my $XDG_DATA_DIRS env var:
echo $XDG_DATA_DIRS 
/usr/share//usr/share/xsessions/plasma:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop

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https://bugs.launchpad.net/bugs/1576500

Title:
  Plasma fails to load:  "all shell packages missing"

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