I updated my Kubuntu system to 18.04 today. The update had been delayed as 'uncalculatable' for a few days. I removed one PPA for MakeMKV and the update proceeded without complaints. After the reboot the system was running nouveux (sp) but all threee monitors functioned as before so I used:
ubuntu-drivers devices
sudo ubuntu-drivers autoinstall
to get nvidia-drivers-390.48-0ubuntu3 installed.
Upon reboot SDDM doesn't function and I'm unable to log in. After looking at dmesg it said (paraphrasing) that nvidia-driver needed a dedicated VGA console driver and a post I found somewhere led me to editing the following line in /etc/default/grub
GRUB_CMDLINE_LINUX="video=vesafb:off vga=normal"
#GRUB_CMDLINE_LINUX=""
and then updating grub. This allowed the system to boot to a command line. SDDM no longer appears to start at all. From there I can log in, run startx, X11 comes up and everything works OK from there.
So, I'm really unsure at this point how to get sddm working again and would appreciate any pointers.
Thanks
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