People keep sending me rar files like its 1999. 7zip is free, open source, and has higher compression ratios: please use it!

So I tried installing on Debian Jessie:

$ sudo apt-get install unrar
==> Reading package lists... Done
==> Building dependency tree
==> Reading state information... Done
==> Package unrar is not available, but is referred to by another package.
==> This may mean that the package is missing, has been obsoleted, or
==> is only available from another source
==> E: Package 'unrar' has no installation candidate

This had always worked before, weird. One thing you can never accuse open source people of is consistency. Fortunately:

$ sudo apt-get install unrar-free

I have it on good authority this will soon be replaced by a nine word systemd command, as part of their archived framework.