Are you fan of flat themes? If yes, this theme is designed for you. Basically this theme is modified version of numix theme, without borders, flat rounded window buttons and grey selection color. It is now compatible with Gtk 3.16 and GTK 3.14, if you experience any kind of issue while using it then report to get it fixed. This theme can work under most of the desktop environments such as Unity, Gnome Shell, Gnome Classic and fallback, Cinnamon, Mate, and others. Square icons used in following screenshots. You can use Unity Tweak Tool, Gnome-tweak-tool or Ubuntu-Tweak to change themes.
Available for Ubuntu 15.10 Wily/15.04 Vivid/other related Ubuntu derivatives
To install Ultra-Flat theme in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
To fix software center text issue enter these commands in terminal:
To revert back software center theme simply enter these commands: