Public bug reported: This shows the message and I made the fix below and the warning went away.
(soffice:1199957): Gtk-WARNING **: 16:01:27.425: Theme parsing error: gtk-widgets.css:1214:18: Not using units is deprecated. Assuming 'px'. /usr/share/themes/Clearlooks-Phenix/gtk-3.0/gtk-widgets.css 1211 combobox > .linked > button.combo:disabled:last-child { 1212 border-image-width: 3px 3px 4px 0; 1213 border-radius: 0 3px 3px 0; - 1214 border-width: 0 1; + 1214 border-width: 0 1px; 1215 } clearlooks-phenix-theme 7.0.1-3 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: clearlooks-phenix-theme 7.0.1-3 [modified: usr/share/themes/Clearlooks-Phenix/gtk-3.0/gtk-widgets.css] ProcVersionSignature: Ubuntu 5.4.0-66.74-generic 5.4.86 Uname: Linux 5.4.0-66-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.16 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: XFCE Date: Sun Mar 7 16:22:37 2021 InstallationDate: Installed on 2015-11-19 (1935 days ago) InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) PackageArchitecture: all SourcePackage: clearlooks-phenix-theme UpgradeStatus: Upgraded to focal on 2020-10-02 (156 days ago) ** Affects: clearlooks-phenix-theme (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug focal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1918081 Title: gtk showswarning from soffice about clearlooks css To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/clearlooks-phenix-theme/+bug/1918081/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs