To install gir1.2-mate-desktop just follow these instructions.
/linuxmint/sarah/backport///install/index.html GObject introspection data for the mate-desktop library mate-about program, as well as some desktop-wide documents. Linux Mint 18 introspection 1.14.1-1+sarah
sudo apt-get install gir1.2-mate-desktop
Which will install gir1.2-mate-desktop and any other packages on which it depends.
|Maintainer||MATE Packaging Team |
|Description||GObject introspection data for the mate-desktop library mate-about program, as well as some desktop-wide documents.|