"Gtk Warning: Theme parsing error" for no-longer-installed extension

Question

I long ago uninstalled the GNOME Extension no-title-bar, but I still get errors launching Gtk apps:

(yad:548): Gtk-WARNING **: 14:05:20.038: Theme parsing error: gtk.css:1:112: Failed to import: Error opening file /home/cat/.local/share/gnome-shell/extensions/[email protected]/stylesheet.css: No such file or directory

(yad:548): Gtk-WARNING **: 14:05:20.038: Theme parsing error: gtk.css:2:118: Failed to import: Error opening file /home/cat/.local/share/gnome-shell/extensions/[email protected]/stylesheet-tiled.css: No such file or directory

The directory .local/share/gnome-shell/extensions/no-title-bar does not even exist, which is why there is a problem. But how do I clean up the warning? The extension has left behind some artifacts?

Solution 1

Likely the file ~/.config/gtk-3.0/gtk.css contains @import url(filename) statements, referring to non-existent files in .../extensions/no-title-bar.

Remove the erroneous import statements from the file gtk.css.

If no-title-bar is still registered as installed:

$ gsettings get org.gnome.shell enabled-extensions | grep --color no-title-bar && echo installed

You can remove its entry from the array org.gnome.shell.enabled-extensions in dconf-editor (apt install dconf-editor) by browsing to org, then gnome, then shell, etc.

There also might remain its entry in org.gnome.shell.extensions. Remove all its sub-keys and the entry org.gnome.shell.extensions.no-title-bar will be removed as well.

Github Forum post

OOO:

You can check enabled extensions with:

gsettings get org.gnome.shell enabled-extensions

If no-title-bar extension is listed, remove it from the array with gsettings or dconf-editor.

enbQao:

...there was still an entry there for that extension. I removed that entry and all other entries I could find... this did not solve the warning. It still shows.

enbQao:

The warning was due to a import statement from ~/.config/gtk-3.0/gtk.css Removing these statements and the warning will not show up anymore.

Solution 2

on 20.04, after upgrading from 18.04

this problem re-surfaced for me recently

my cause & solution:

• there was a snap package installed, gtk-themes-common (I think), which contained Yaru theme files
• it clashed with the system installed gtk-theme Yaru
• removal of the snap solved my problems

Comments

[Rinzwind]

warnings are not for you to fix but for the maintainers ;-)

[cat]

@Rinzwind the extension doesn't work on shell 3.30 anyway, so i would have to wait for it to be updated, re-install it, and uninstall it again -- no point