Same symptoms(*) here after a fresh upgrade to 18.04. Tried installing gdm, as suggested above, and also adding "xrandr" as suggested, here: https://forums.fedoraforum.org/showthread.php?316354 -SDDM-shows-black-screen-with-Nvidia . Neither made a difference for me.
However, the problem finally went away after switching to the nouveau driver. (And I have no recollection of ever asking for the proprietary nvidia driver, specifically, but I may be wrong about that.) (*) Symptoms: sddm, but also lightdm and gdm3 showing only black. startx brings up an xfce session without problems. -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to sddm in Ubuntu. https://bugs.launchpad.net/bugs/1765923 Title: Nvidia driver leads to black screen on bionic 18.04 SDDM LightDM bug? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1765923/+subscriptions -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
