In default setup, Linux Mint installs gedit in version 2.x. In order to use more recent version of this editor (for example for Markdown support), you can follow the instruction below.
Linux Mint 17.3
sudo apt-get purge gedit
sudo apt-get purge gedit-common
sudo apt-get install gedit-common/trusty
sudo apt-get install gedit/trusty
Result: gedit 3.10.4 installed.
piotr@mint ~ $ dpkg -s gedit | grep Version
Version: 3.10.4-0ubuntu4
See also:
This is what I'm finding. Thank you so much :)