percebi que falta um ícone na loja ubuntu alem de a própria está com o fundo transparente.

[Williamgarcia86]

isso ocorre em todos os temas .

[Muqtxdir]

Hi @Williamgarcia86,

Ubuntu-Software(Snap-store) is packaged as Snap-app in Ubuntu 20.04 LTS
Snap-apps only support themes which are in gtk-common-themes snap.

I guess Ant is not ported for Snaps. Hence, the problem of Transparent background in Ubuntu-Software

The safe solution for this issue seems to involve reverting of theme to default Yaru-theme(only for Ubuntu-software) using GTK+inspector-tool

Solution:

• To enable Inspector -> gsettings set org.gtk.Settings.Debug enable-inspector-keybinding true (In terminal)
• Using GNOME-Tweaks change the Application theme to Yaru
• Open Ubuntu-Software app
• Press Ctrl+Shift+I and Navigate to Visual Tab
• Change GTK+Theme to Yaru theme and close it
• Using GNOME-Tweaks change the Application theme back to Ant theme
• Open Ubuntu-Software app and Now it is displayed in default Ubuntu-theme instead of being transparent

Note: This themeing-workaround can be applied to any GTK-based Snap apps.Sadly I don't know how to preserve this change after every reboot.(I guess it should be done every time)

Hope this workaround improves your situation