Enabling a Theme on Ubuntu

Personally I love dark themes. You Know it is always easy and comfortable to work with a dark high contrast environment in a computer, for a developer. In Ubuntu, you can use Dark themes for this purpose. In order to install a theme, you have to install "Unity Tweak Tool" first from Ubuntu Software Center or runiing following command on your terminal

 sudo apt-get install unity-tweak-tool

In this article you can find a list of themes and commands for install them. following commands are for installing Ambiance-Dark theme.

1. sudo add-apt-repository ppa:noobslab/themes

2. sudo apt-get update

3. sudo apt-get install ambiance-dark

But after executing first command if you are getting an error as following screenshot, most probably you are using a proxy server.

There are two ways to get rid of this issue

The lazy mans way

1. Connect to a non proxy network, you can use a dongle or any other none proxy connection to this.
2. Run the first command.
3. If you have no data usage problems, run remaining two commands in while you connected to the same network, Otherwise connect again to the proxy network and run the remaining two commands.

The real way

In this this article you can find the real way.

I use my University's free wifi network which uses a proxy server whenever it is possible because I have a limited data quota in my mobile broadband package. Using any method mentioned above, you can save your data and your money.

Enjoy....