As you may know, Geany is a free, open-source, lightweight and fast text editor, providing the main features of an IDE, including syntax highlighting, code folding, support for popular programming languages, automatic indentations, and automatic closing of XML and HTML tags. Also, its usability can be extended via plugins.
The latest version available is Geany 1.25, which brings support for GTK+3, got support for CoffeeScript, JSON and Zephir coding languages, display dialogs directly in the text editor and the search feature has received support for regular expressions (regex). For more information, see the commit history on Git.
Up to date packages are available via some third party PPA, so installing Geany on Ubuntu 15.04 Vivid Vervet, Ubuntu 14.04 Trusty Tahr and derivative systems like Linux Mint 17.2 Rafaela, Linux Mint 17.1 Rebecca, Linux Mint 17 Qiana and Elementary OS 0.3 Freya systems should not cause too many problems.
All you need to do is add the PPA to your system, update the local repository index and install the geany package:
$ sudo add-apt-repository ppa:geany-dev/ppa
$ sudo apt-get update
$ sudo apt-get install geany
Optional, to remove geany, do:
$ sudo apt-get remove geany