I wanna install the noobslab Dark Theme in Ubuntu 14.04. I'm following the steps defined in the site http://www.noobslab.com/2014/05/delorean-dark-theme-updated-install-in.html but when I try the first step

sudo add-apt-repository ppa:noobslab/themes

I get the following error

Cannot add PPA: 'ppa:noobslab/themes'. Please check that the PPA name or format is correct.

Can someone please guide me to install the theme?

I've been searching for an hour and I don't get any answer to this error.

I'm behind a proxy and I checked the /etc/apt/apt.conf and it seems to be OK. Here it's

Acquire::http::proxy "";
Acquire::https::proxy "";
Acquire::ftp::proxy "";
Acquire::socks::proxy "socks://";

I'm new in Linux and I don't have idea about what can be happening :(



Add the lines below to your systems software sources:

deb http://ppa.launchpad.net/noobslab/themes/ubuntu trusty main

deb-src http://ppa.launchpad.net/noobslab/themes/ubuntu trusty main

source: https://launchpad.net/~noobslab/+archive/ubuntu/themes

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