It appears you're using the GNOME Adwaita theme, which may not support
dark mode. In fact upstream GNOME doesn't even have an Appearance tab.
Please try changing your theme back to Ubuntu's Yaru and then dark mode
will work.
** Changed in: gnome-shell (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1875638
Title:
Dark theme in 20.04
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