Public bug reported:

Upgraded to Xenial, and Plasma disappeared.  Starting the X server, I get a 
blank screen, then error messages indicating that there is no Plasma shell.  In 
particular, 
"All shell packages missing.
This is an installation issue, please contact your distribution"

Expected:  window manager, task bar, icons, wallpaper, widgets etc. load with X
Actual:  Not so much.
Repeatable:  every time.
plasma-desktop version:  4:5.5.5-0ubuntu1
Architecture:  amd64

This happened on only one of my three systems.  I've attached a
screenshot of the full screen including the three error windows.  It
asks for a bug report on krunner.

Application switching works (upper left corner and Alt-Tab).  Screen resolution 
and colours seem fine.  Icons are often absent (e.g. absent in Emacs but 
present in Chromium), and passing the mouse over an absent button dumps this to 
the originating terminal window:
(emacs:2916): GLib-GObject-CRITICAL **: g_object_ref: assertion 'G_IS_OBJECT 
(object)' failed

Starting plasmashell from Konsole:
$ plasmashell
Icon theme "breeze" not found.
Icon theme "oxygen" not found.
Error: standard icon theme "oxygen" not found!
Failed to load the OSD QML file file from ""

This also brings up the "all shell packages missing" window.  Closing that 
returns
We have no shell handlers installed
on the Konsole.

The screen locker doesn't work, so instead it tells me to go to a
virtual terminal and unlock it from there.  That works.

Konsole has lost use of the arrow keys, which makes things like Nano
very difficult to use.  I don't know whether that's related.

I tried apt-get --reinstall install  for all installed plasma packages.

Quirks of current installation:  
I boot into text mode, then start the X server with startx, and before the 
upgrade I was using fglrx drivers from 
http://ppa.launchpad.net/costamagnagianfranco/locutusofborg-ppa/ubuntu (both 
changes were done to allow Boinc to access the ATI GPU).  The driver has 
evidently not yet been released for 16.04, but X falls back to an ATI driver 
that seems to work perfectly well.

How I got access to Konsole:  
Thunderbird starts with X.  
An e-mail containing a link can be used to open chromium, my default browser.
Chromium's Downloads tab allows me to open the containing folder.  Dolphin runs 
fine from Konsole (but without icons), but chromium doesn't like dolphin today, 
so it asks for an alternative program for opening the folder.  I tell it 
"konsole", I get that, and I can use my system again.  Sort of.  With no 
KDE/Plasma widgets/taskbar etc., no icons in many programs, and reduced 
functionality in the terminal, the GUI is extremely clunky and annoying to use.

Possibly related to 
https://bugs.launchpad.net/ubuntu/+source/kubuntu-meta/+bug/1571564 
Brief earlier discussion at http://ubuntuforums.org/showthread.php?t=2321538

Hopefully ubuntu-bug uploaded what it needed to.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: plasma-desktop 4:5.5.5-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Apr 29 11:40:01 2016
InstallationDate: Installed on 2015-11-26 (154 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: plasma-desktop
UpgradeStatus: Upgraded to xenial on 2016-04-27 (2 days ago)

** Affects: plasma-desktop (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

** Attachment added: "Windows visible upon starting X"
   
https://bugs.launchpad.net/bugs/1576500/+attachment/4650937/+files/Plasma_fail1.png

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

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

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