How to upgrade GTK 3.10 to GTK 3.14 on Ubuntu 14.04?

Question

How to upgrade GTK 3.10 to 3.14 on ubuntu 14.04? Most of the discussions provide an answer in which they replace the Unity desktop with the GNOME desktop. I want to do this upgrade without adding any other desktop environment. Kindly provide step by step method if possible.

P.S.: this upgrade is required for installing ARC GTK Theme.

Solution

You'll probably need install a version of a Ubuntu that supports 3.14 then (i.e. 15.04).

Alternately, you could work your way through redoing versions of the relevant packages from source so they don't break 14.04 (probably very difficult), or redo the theme to work better with older versions

Also, installing Gnome/gtk 3.14 in 14.10 (and probably 3.12 in 14.04) with the available GNOME PPAs [1] [2] breaks Unity, so probably would make a bigger mess trying to install the available 3.14 packages in 14.04.