Upgrade to Kubuntu 16.04 LTS had issues

[Leroy Tennison]

I noted Kubuntu is a volunteer project and I appreciate the work.  I 
just upgraded from 14.04 to 16.04 and ran into issues:

Apparently kdm isn't available, 'apt-get install kdm' reports "Package 
'kdm' has no installation candidate" but kde-workspace-data 
kde-wallpapers replaces it, 'apt-get install kde-workspace-data 
kde-wallpapers' reports "Package 'kde-workspace-data' has no 
installation candidate" but the following packages replace it: . kdm 
..." - note we are now into a circular reference.

I selected sddm as the display manager at the second prompt during 
install (if I remember correctly, kdm was available at the first prompt) 
because LightDM is too limited for me and finally got it to work by 
doing the following: Placing '/usr/bin/sddm &' in /etc/rc.local.  My 
first attempt was to create /etc/sddm.conf by 'sddm --example-config > 
/etc/sddm.conf' - didn't work, got a black screen instead of a display 
manager on reboot.  Second attempt was 'systemctl enable sddm.service' 
which reported success but, on reboot - black screen.  Third attempt was 
placing '/usr/bin/sddm' in /etc/rc.local - that produced a display 
manager but Ctrl-Al-F1 produced the initial Kubuntu screen and Ctrl-D 
showed the progress but I couldn't get a prompt, Ctrl-Alt-F2 through F6 
simply didn't work.  Adding the & provided Ctrl-Alt-F[1..6] functionality.

I had to set Folder view to restore my icons (I haven't arranged them 
back like they were yet) and re-pick a wallpaper.  Although more icons 
worked than didn't I had to recreate the icon for the following to get 
it to work: Dolphin, kpat, kbounce, kmines, kshisen, Gwenview, kcalc, 
kwrite, okteta and Opera.  Before I did I typically got "KDEInit could 
not launch <path/app>" or the desktop file opened in Kate.  I also got a 
couple of odd messages about not being able to find the app file 
(although they all launched successfully from a terminal prompt).  
Inkscape was somehow no longer installed, reinstalling and recreating 
the icon resolved the issue.  Interestingly, Dolphin and Kcalc no longer 
have an icon available.  Dolphinsu hangs on launch.

As a personal preference, I wasn't satisfied with the new window 
decoration, it took a little looking to find that right-clicking on any 
window title, selecting More Actions then Window Manager Settings 
allowed me to install/select a theme I liked.

Hopefully some of this helps someone else, I am wondering if kdm will be 
available in the future and if there is a better way to implement sddm 
than I found.