Разработчиками Mint было объявлено о прекращении работ по развитию Mint основанном на Ubuntu. Отныне разработка MInt будет основана на Arch Linux.

Далее цитаты из источника:

Brief: Mark this day. This is the day when Linux Mint has decided to leave Ubuntu for Arch Linux.
Remember when Google thought that Arch Linux was an Ubuntu-based distro? Well, nothing has changed on that front.
On the other hand, Linux Mint has taken the extraordinary decision of moving away from Ubuntu. Chem, the lead developer of Linux Mint, announced the shocking news in a blog post.

mint-arch-ubuntu.jpeg

Linux Mint has been based on Ubuntu since its inception. It is often considered a better version of Ubuntu. It also has a Debian based version LMDE (Linux Mint Debian Edition). So why has the Mint team decided on switching to Arch Linux from Ubuntu?
Enough of the ‘noobs distro’ tag
Every time a new Linux user asks which distribution to use, Linux Mint is almost always the answer. People see it as a beginner-friendly distribution that new Linux users can easily use. But this is what Mint team doesn’t like anymore.
Chem explains:
“We have been in the industry for close to twelve years. In so many years, even junior developer turns into a senior developer, willingly or unwillingly. But even after twelve years, Linux Mint is still considered to be for noobs. We want to grow up and be considered an expert’s Linux distribution this is why we created our Debian edition, LMDE but it didn’t change our image at all. People still call us beginner’s distribution. So we think it’s time to raise the bar and move to Arch Linux.”
Chem says that even if after moving to Arch Linux people call Mint a friendly distribution, they plan to switch to Gentoo and then they’ll see how would anyone call it a noob’s distro while compiling all those packages.
It will be interesting to see how things go with this bold move. Perhaps we’ll now start seeing random “I use Mint” phrases on Linux forums and IRC.

Собственно источник и дополнительные разъяснения по ссылке ниже:

linuxmint.com/develop/

linuxmint.com.ru