SUMMARY STEPS TO REPRODUCE 1. Update qt and libqt packages to version 5.15 from 5.14.2+dfsg-0+xneon+20.04+focal+build11 2. Reboot 3. Observe black screen with cursor in place of sddm login OBSERVED RESULT Graphical desktop is inaccessible. EXPECTED RESULT Normal login screen (sddm) and access to desktop login. SOFTWARE/OS VERSIONS Windows: N/A macOS: N/A Linux/KDE Plasma: 5.8.6-050806-generic (available in About System) KDE Plasma Version: 5.19.5 KDE Frameworks Version: 5.73.0 Qt Version: 5.15 ADDITIONAL INFORMATION I observed that in the current version of KDE neon Developer that qt 5.15 was not yet included. Should this qt release have been tested there first?
There's no qt 5.15 in the user archive You might have the /release archive enabled, this is our staging area and should not be used unless you know what you are testing
I was an early adopter during trial upgrades to focal. Hence it appears you are correct, as my neon.list file contains the following: deb http://archive.neon.kde.org/release/ focal main deb-src http://archive.neon.kde.org/release/ focal main Should I change "release" to "user" in this file?
This is what the user totof (on Matrix) posted about the fix yesterday: "for information : fix my issue was ... change the neon.list files by replacing release by user, then apt update then downgrade qt to 5.14.2 then apt install neon-desktop for reinstalling some missing packages as sddm and yipi it works again"