Comment 0 for bug 1832137

In an ubuntu session the default shell theme is Yaru. In a vanilla gnome session the default shell theme is Adwaita. In both cases, there is no way to pick the other shell theme. Of course, I agree with the defaults, but arguably one might be interested in using Yaru in a vanilla gnome session and viceversa. Plus, the ability to change the gtk theme to Adwaita in an ubuntu session is crippled by the inability to also change the shell theme in a consistent way (and viceversa).

The problem is that these themes get installed under /usr/share/gnome-shell/theme and not under /usr/share/themes/<Theme>/gnome-shell as is usually the case with every other third party theme. But it's simple to fix this in order to allow for selecting the alternative theme: symlink from /usr/share/themes/<Theme>. For example:

    ln -s /usr/share/gnome-shell/theme/Yaru /usr/share/themes/Yaru/gnome-shell

The only downside I see is that you will have Yaru as an alias to Default under an ubuntu session and Adwaita as an alias to Default under a vanilla session. That is, two options in the dropdown will refer to the same underlying theme. But this seems quite innocuous to me, specially for a user that has already made his/her way into Tweaks and theme customization. And arguably having an explicitly named option and a default option may even be desirable.