I'll just toss here a list of problems I have with the recent upgrade to kubuntu 15.04
I'll accept that all my settings are gone because of the change of framework 4 to 5 (it would have been nice to get a big fat warning about it, or better an update/transfer method), but during the upgrade process I was asked if I wanted to keep LightDM or use the new SDDM. I chose the former, but still the latter was installed and causes problems (how do I switch between them ?)
In particular I now cannot unlock a locked screen: after I type my password, it blacks out briefly then comes back to the login screen. I can't start a new session either. After I reboot I get a crash screen about a sddm-greeter crash. Also there's no [Off]/[Reboot] buttons on the login screen.
Once logged in, if I try to log out or reboot I get plenty of crash window for various kde and sddm components and can't cleanly logout/reboot.
Something else very annoying: there's no more console in Ctrl-Alt-F2 and others. Just a black screen. Typing login/passwd blind doesn't work.
I switched from
fglrx-updatestoxserver-xorg-video-atiand it solved both the unlock-able lock screen problem and the blank consoles problem.<< But now I get a black screen upon wake up... Arghhh. >>
Me, too. Switching from fglrx to xorg video for my ATI graphics card solved my blank Ctrl-Alt-F1 console screen problem, and restoring a $HOME/.config/plasma-org.kde.plasma.desktop-appletsrc file that wasn't missing 60 lines of "[Containments]" got me a working desktop.
But when I wake up the next morning, after leaving the computer running without user interaction for 6 to 8 hours, the screen is blank, and I have to reboot to get a working screen again. My background cron jobs continued to run just fine, and I cannot find any logged error messages or such that might explain the screen outage.
This is on Kubuntu 15.04 using sddm, x86_64, Vivid Vervet, Desktop PC (always on AC, no battery).
Arghhh