- remove using of gnome-pkg-tools: details in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1122833 It's quick and easy and should list the other packages where is need to do this on. If I'm not mistaken, it's very likely unused and therefore shouldn't require advanced searches and checks.
- cinnamon: please replace transitional python3-tz dependency with python3-pytz: details https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1121834 It should be checked in the sources to see if it is still actually used, if it is no longer used it should be removed, otherwise it should be replaced
- directly Build-Depends on dbus (cinnamon and muffin): see for example https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1122680 for muffin, this requires reading the documentation and doing some checking and research in the source.
- depends on non-multiarch-friendly libgirepository1.0-dev: see for example https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1118934 for xapp (there are similar bugs opened in other component), this requires reading the documentation and doing some checking and research in the source.
I also started with similar things in 2014 when I was almost inexperienced in packaging.
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