That a fake Mint-distro (consider it a fork that no one would knowingly download & install (unlike Windows 10)) had to be created in order to insert a back door into the Operating System, speaks volumes about how difficult it is to infect *NIX with malware. The website was a trusted source, compromising it was really a social engineering hack to get their bastard-child (no one is claiming fathership) out of the nest.
So to sum up. The web site was hacked in order to distribute a malicious fork of Linux-Mint which contained a back-door. And how well did that work out for the bad-guys?