As a result of MATE 1.8.1 hitting the Debian testing repositories earlier this year, MATE 1.8.1 is also in the official archive for Ubuntu 14.10 Utopic Unicorn. The Ubuntu MATE team have recently created a MATE 1.8.1 PPA for Ubuntu 14.04 Trusty Tahr at the request of the Ubuntu Technical Board and also a MATE 1.8.1 PPA for Ubuntu 12.04 Precise Pangolin
If you require MATE packages for Debian or Ubuntu then the package repositories above are the official repositories to use.
We’ve removed the package repositories hosted on mate-desktop.org because some were unsigned and others have not been maintained for many months. Therefore, as of now, the Debian and Ubuntu package repositories hosted on mate-desktop.org have been removed.