I don't really understand why people are focusing on the ugly symlink workaround. It seems to me that the obvious immediate fix for the warning is to just delete the offending line from gtk-main.css. Of course, the deeper question is whether gnome-builder.css used to provide some important functionality, and whether that functionality needs to be replaced somehow.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ubuntu-themes in Ubuntu. https://bugs.launchpad.net/bugs/1773045 Title: Radiance/gtk-3.20/gtk-main.css attempts to import nonexistent gnome- builder.css Status in Ubuntu theme: Confirmed Status in ubuntu-themes package in Ubuntu: Confirmed Bug description: The file /usr/share/themes/Radiance/gtk-3.20/gtk-main.css contains the line @import url("apps/gnome-builder.css"); But this file does not exist in this package or any other, as far as I can tell from apt-file. This triggers an annoying warning when running various applications (e.g. evince): (evince:12714): Gtk-WARNING **: 18:41:45.136: Theme parsing error: gtk-main.css:73:38: Failed to import: Error opening file /usr/share/themes/Radiance/gtk-3.20/apps/gnome-builder.css: No such file or directory ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: light-themes 16.10+18.04.20180421.1-0ubuntu1 ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17 Uname: Linux 4.15.0-22-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 Date: Wed May 23 18:58:41 2018 PackageArchitecture: all SourcePackage: ubuntu-themes UpgradeStatus: Upgraded to bionic on 2018-05-23 (1 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-themes/+bug/1773045/+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