I'm using Materia GTK theme in ubuntu 18.04. It's in the repos but it's an older version. I'm trying to keep it updated (when I update my system, just like Spotify .deb does). So I've tried to use the https://packages.debian.org/unstable/materia-gtk-theme repository in Software and sources GUI , adding `deb https://packages.debian.org/ sid all materia-gtk-theme, but I've got the following error.
E: GPG error: https://packages.debian.org unstable Release: Signed file isn't valid, got 'NODATA' (does the network require authentication?). "
Anyone knows how fix it? Or use another way to keep my theme always updated? (Currently there is no official PPA.)
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