You need to install the 'user-theme' extension, which is part of this
package:
sudo apt install gnome-shell-extensions
** Changed in: gnome-control-center (Ubuntu)
Status: Expired => Invalid
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[Expired for gnome-control-center (Ubuntu) because there has been no
activity for 60 days.]
** Changed in: gnome-control-center (Ubuntu)
Status: Incomplete => Expired
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