MarsSeed [1] filed a deletion request for gnome-shell-extension- mailnag [2]: Defunct VCS package in disguise. Upstream is unmaintained since 3.5+ years ago [a], and the extension is not compatible with GNOME Shell 41+. [b] [a]: http://github.com/pulb/mailnag-gnome-shell [b]: http://github.com/pulb/mailnag-gnome-shell/blob/master/metadata.json [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/gnome-shell-extension-mailnag/