After applying the available upgrades on October 31 to my Fedora 42 system running KDE, the system would not display the login screen after reboot. I could log in to a terminal via ctrl-alt-f2, and I saw the message shown in the bug summary in the 'journalctl -b' output. Reproducible: Always Steps to Reproduce: 1.Reboot 2. 3. Actual Results: No login screen. Expected Results: Login screen appears. Additional Information: The KDE spin of Fedora 42 is running on a Dell Latitude E5530 laptop and has worked wonderfully for years and multiple Fedora versions. A big thank you to everyone who has and continues to work on Fedora. I also have the XFCE spin running on some older Dell Optiplex desktops and the GNOME Fedora spin running on an HP 420Z workstation.
Seeing the same symptopms on two systems (Dell like above and Thinkpad C13 Yoga). Only "user" option is to choose Gnome on login screen. After succesfull Gnome login, running kwin in terminal gives the same: $ kwin kwin: symbol lookup error: kwin: undefined symbol: _ZN21KGlobalAccelInterface10keyPressedEi The only threads i found online are: https://discussion.fedoraproject.org/t/sddm-failure-after-system-update/171613/3 (the f42 fix from https://bodhi.fedoraproject.org/updates/FEDORA-2025-ebed8db9ab did not install, as in comment) and (inaccurate?) https://github.com/clearlinux-pkgs/kglobalaccel/blob/main/symbols dnf repoquery --installed | grep kglobal kf5-kglobalaccel-0:5.116.0-3.fc42.x86_64 kf5-kglobalaccel-libs-0:5.116.0-3.fc42.x86_64 kf6-kglobalaccel-0:6.19.0-1.fc42.x86_64 kglobalacceld-0:6.5.1-1.fc42.x86_64 dnf repoquery --installed | grep kwin kf5-kwindowsystem-0:5.116.0-3.fc42.x86_64 kf6-kwindowsystem-0:6.19.0-2.fc42.x86_64 kwin-0:6.4.5-1.fc42.x86_64 kwin-common-0:6.4.5-1.fc42.x86_64 kwin-libs-0:6.4.5-1.fc42.x86_64
as mentioned in thread https://discussion.fedoraproject.org/t/sddm-failure-after-system-update/171613/14 the fixes from https://bodhi.fedoraproject.org/updates/FEDORA-2025-1cae83c73e sudo dnf upgrade --refresh --advisory=FEDORA-2025-1cae83c73e followed by https://bodhi.fedoraproject.org/updates/FEDORA-2025-ebed8db9ab sudo dnf upgrade --refresh --advisory=FEDORA-2025-ebed8db9ab fixed plasma for me. yay!
Running the first 'dnf upgrade' command pulled down a variety of updates which did the trick. The second 'dnf upgrade' command didn't match anything. My laptop is once again working normally. Thanks to all who contributed to fixing the issue.