I'm using X-Arc-White GTK theme in my freshly installed Ubuntu 18.04 desktop. I looks really amazing, but there's a problem with GNOME own applications, like system monitor or calculator. They are shown only with default Adwaita theme.

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The only themes which work for all programs are Ambiance and Radiance. Is there a reason for that behaviour?

  • Hey Meiden. How did you install the theme? Where are the theme files stored?
    – Hee Jin
    May 3 '18 at 15:10
  • Hi. At the first, I've got the themes stored in ~/.themes, then I moved them into /usr/share/themes but the problem persist. Thank you.
    – Meiden
    May 3 '18 at 15:14

It seems those are applications installed as snap packages. You may verify it by running

snap list

The snap execution environment doesn't see any of the themes on your system (local or system-wide). So this is somewhat an expected behaviour.

As a workaround you may remove those snap applications by running

snap remove <package-name>

and install their apt versions by running

sudo apt install <package-name>
  • 3
    Whoa I'm very surprised. So Canonical is introducing snap applications as default in Ubuntu? I didn't install any of those snap packages but your suggestion was totally right. Thank you very much.
    – Meiden
    May 3 '18 at 20:29

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