Any update on this bug? To this day I still can't use Opera on my Ubuntu which kinda sucks since Opera is always my default browser.
My Fedora is running flatpak Opera with no issues.
I already removed and installed Opera via snap a bunch of times and still the same error.
I tried manually soft linking the files and still crashes:
$ ls -lZ /home/<user>/snap/opera/455/.config/gtk-3.0/
total 0
lrwxrwxrwx 1 <user> admin ? 39 May 18 13:31 bookmarks -> /home/<user>/.config/gtk-3.0/bookmarks
lrwxrwxrwx 1 <user> admin ? 37 May 18 13:31 gtk.css -> /home/<user>/.config/gtk-3.0/gtk.css
lrwxrwxrwx 1 <user> admin ? 42 May 18 13:31 settings.ini -> /home/<user>/.config/gtk-3.0/settings.ini
$ ln -s /home/<user>/.config/gtk-3.0/colors.css /home/<user>/snap/opera/455/.config/gtk-3.0/
$ ls -la /home/<user>/snap/opera/455/.config/gtk-3.0/
total 8
drwxr-xr-x 2 <user> admin 4096 May 19 10:05 .
drwx------ 8 <user> admin 4096 May 18 13:31 ..
lrwxrwxrwx 1 <user> admin 39 May 18 13:31 bookmarks -> /home/<user>/.config/gtk-3.0/bookmarks
lrwxrwxrwx 1 <user> admin 40 May 19 10:05 colors.css -> /home/<user>/.config/gtk-3.0/colors.css
lrwxrwxrwx 1 <user> admin 37 May 18 13:31 gtk.css -> /home/<user>/.config/gtk-3.0/gtk.css
lrwxrwxrwx 1 <user> admin 42 May 18 13:31 settings.ini -> /home/<user>/.config/gtk-3.0/settings.ini
I don't get the file not found error but Opera still doesn't open and shows some of the same errors:
$ journalctl -f
systemd[17888]: Started snap.opera.opera-4aa5b86e-6b49-4e1f-bc12-a5dd334c1230.scope.
May 19 10:11:50 dbus-daemon[17939]: apparmor="DENIED" operation="dbus_method_call" bus="session" path="/org/freedesktop/secrets" interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send" name="org.freedesktop.secrets" pid=819992 label="snap.opera.opera" peer_pid=17924 peer_label="unconfined"
May 19 10:11:51 opera[819921]: Not loading module "atk-bridge": The functionality is provided by GTK natively. Please try to not load it.
May 19 10:11:51 opera[819921]: Failed to load module "colorreload-gtk-module"
May 19 10:11:51 opera[819921]: Failed to load module "window-decorations-gtk-module"