I have this problem on Linux Mint 19.1, which is based on Ubuntu 18.04.1 (although admittedly I am running the alpha of Mint 19.2).
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gtk+3.0 in Ubuntu. https://bugs.launchpad.net/bugs/1061554 Title: assertion failure `trap != NULL' displayed by all GTK3 software Status in gtk+3.0 package in Ubuntu: Fix Released Bug description: All GTK3/GNOME3 software I tried (gedit, evince, evolution, ...) display the following error message: $ gedit (gedit:5387): Gdk-CRITICAL **: gdk_error_trap_pop_internal: assertion `trap != NULL' failed ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: libgtk-3-0 3.6.0-0ubuntu2 ProcVersionSignature: Ubuntu 3.5.0-16.15-lowlatency 3.5.4 Uname: Linux 3.5.0-16-lowlatency i686 ApportVersion: 2.6.1-0ubuntu1 Architecture: i386 Date: Thu Oct 4 13:56:41 2012 EcryptfsInUse: Yes SourcePackage: gtk+3.0 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1061554/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp