File Roller supports unar since GNOME 3.8, Ark doesn't while it has patches available [0][1]. That patch is used in Parabola and maybe could be added to Trisquel. These require not having unrar installed (or unar wrapper like ununrar).
I don't want to learn another command line interface for each archive format, so I use bsdtar which supports RAR with new enough libarchive. (No multivolume nor encrypted archives.) [0] https://bugs.kde.org/show_bug.cgi?id=283134 [1] https://git.reviewboard.kde.org/r/106294/
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