https://bugs.kde.org/show_bug.cgi?id=390918

--- Comment #7 from Winston Nolan <winston.no...@gmail.com> ---
Hi Hi, 

I was on KDE Plasma Neon 5.12.1 using this repository: 
deb http://archive.neon.kde.org/release xenial main

I am running a fully updated Ubuntu 16.04. I was notified in the notification
area of updates that was ready to download and install. I selected to update
all. 
When this was done, I was prompted for more updates, I updated all. When this
was done I rebooted for good measure. Got to the KDE login screen. Logged in
and got the black screen with a mouse cursor.

I tried to move .config .local .cache .kde to a backup folder. Tried again same
thing. 

dpkg -l | grep -i mesa shows

ii  libegl1-mesa:amd64                                   
17.2.8-0ubuntu0~16.04.1                                  amd64        free
implementation of the EGL API -- runtime
ii  libegl1-mesa-drivers:amd64                           
12.0.6-0ubuntu0.16.04.1                                  amd64       
transitional dummy package
ii  libgl1-mesa-dev:amd64                                
17.2.8-0ubuntu0~16.04.1                                  amd64        free
implementation of the OpenGL API -- GLX development files
ii  libgl1-mesa-dri:amd64                                
17.2.8-0ubuntu0~16.04.1                                  amd64        free
implementation of the OpenGL API -- DRI modules
ii  libgl1-mesa-dri:i386                                 
17.2.8-0ubuntu0~16.04.1                                  i386         free
implementation of the OpenGL API -- DRI modules
ii  libgl1-mesa-glx:amd64                                
17.2.8-0ubuntu0~16.04.1                                  amd64        free
implementation of the OpenGL API -- GLX runtime
ii  libgl1-mesa-glx:i386                                 
17.2.8-0ubuntu0~16.04.1                                  i386         free
implementation of the OpenGL API -- GLX runtime
ii  libglapi-mesa:amd64                                  
17.2.8-0ubuntu0~16.04.1                                  amd64        free
implementation of the GL API -- shared library
ii  libglapi-mesa:i386                                   
17.2.8-0ubuntu0~16.04.1                                  i386         free
implementation of the GL API -- shared library
ii  libgles2-mesa:amd64                                  
17.2.8-0ubuntu0~16.04.1                                  amd64        free
implementation of the OpenGL|ES 2.x API -- runtime
ii  libglu1-mesa:amd64                                    9.0.0-2.1            
                                   amd64        Mesa OpenGL utility library
(GLU)
ii  libglu1-mesa:i386                                     9.0.0-2.1            
                                   i386         Mesa OpenGL utility library
(GLU)
ii  libglu1-mesa-dev:amd64                                9.0.0-2.1            
                                   amd64        Mesa OpenGL utility library --
development files
ii  libopenvg1-mesa:amd64                                 10.1.3-0ubuntu0.6    
                                   amd64        free implementation of the
OpenVG API -- runtime
ii  libosmesa6:amd64                                     
17.2.8-0ubuntu0~16.04.1                                  amd64        Mesa
Off-screen rendering extension
ii  libosmesa6:i386                                      
17.2.8-0ubuntu0~16.04.1                                  i386         Mesa
Off-screen rendering extension
ii  libtxc-dxtn-s2tc0:amd64                               0~git20131104-1.1    
                                   amd64        Texture compression library for
Mesa
ii  libtxc-dxtn-s2tc0:i386                                0~git20131104-1.1    
                                   i386         Texture compression library for
Mesa
ii  libwayland-egl1-mesa:amd64                           
17.2.8-0ubuntu0~16.04.1                                  amd64       
implementation of the Wayland EGL platform -- runtime
ii  mesa-common-dev:amd64                                
17.2.8-0ubuntu0~16.04.1                                  amd64        Developer
documentation for Mesa
ii  mesa-utils                                            8.3.0-1              
                                   amd64        Miscellaneous Mesa GL utilities
ii  mesa-va-drivers:amd64                                
17.2.8-0ubuntu0~16.04.1                                  amd64        Mesa
VA-API video acceleration drivers
ii  mesa-vdpau-drivers:amd64                             
17.2.8-0ubuntu0~16.04.1                                  amd64        Mesa
VDPAU video acceleration drivers

My /var/log/Xorg.0.log is attached

I do not know about alt+f2 :(

The only way I managed to get my system back was 

sudo apt-get purge kde-* neon-* plasma-*
then 
sudo apt-get install plasma-desktop

If you need more information let me know

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