Further to comment #8, I can confirm that invoking gnome-font-viewer from the command line allows the program to start normally when invoked from either the dock or the Application overview. This is with my Eoan installation which has now been upgraded to the development version of Focal. As the reporter of the bug I'll update the bug description to reflect this work around.
** Description changed: Reproducible crash (tested on Ubuntu and Xubuntu) or freezing of application during ISO testing of a live-session. Application will crash if there is an attempt to close it or scroll through fonts. On one occasion my laptop was rendered unusable when Firefox was launched while trying to report the crash to Launchpad. After the bug report has been sent gnome-font-viewer will freeze when automatically restarted. No fonts are displayed. + + Work around + ----------- + gnome-font-viewer appears to start correctly when started from the command line. Subsequent attempts to start the program will succeed if started from the dock or the Application Overview. ProblemType: Crash DistroRelease: Ubuntu 19.10 Package: gnome-font-viewer 3.34.0-1 ProcVersionSignature: Ubuntu 5.3.0-10.11-generic 5.3.0-rc8 Uname: Linux 5.3.0-10-generic x86_64 ApportVersion: 2.20.11-0ubuntu7 Architecture: amd64 CasperVersion: 1.416 CurrentDesktop: XFCE Date: Wed Sep 25 17:34:17 2019 ExecutablePath: /usr/bin/gnome-font-viewer LiveMediaBuild: Xubuntu 19.10 "Eoan Ermine" - Beta amd64 (20190925) ProcCmdline: gnome-font-viewer ProcEnviron: LANGUAGE=en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=C.UTF-8 SHELL=/bin/bash Signal: 5 SourcePackage: gnome-font-viewer StacktraceTop: ?? () from /lib/x86_64-linux-gnu/libX11.so.6 ?? () from /lib/x86_64-linux-gnu/libX11.so.6 _XEventsQueued () from /lib/x86_64-linux-gnu/libX11.so.6 XPending () from /lib/x86_64-linux-gnu/libX11.so.6 ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0 Title: gnome-font-viewer crashed with signal 5 in _XEventsQueued() UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo separator: ** Tags added: focal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1845362 Title: gnome-font-viewer crashed with signal 5 in _XEventsQueued() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-font-viewer/+bug/1845362/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
