I have followed exactly the same instructions for installing xkcd-browser but facing the dependency issues
sudo add-apt-repository ppa:brianrobles204/xkcd-browser;
sudo apt-get update;
sudo apt-get install xkcd-browser
Source : http://www.omgubuntu.co.uk/2012/08/20-must-have-ubuntu-showdown-apps
The following packages have unmet dependencies:
xkcd-browser : Depends: gir1.2-gwibber-gtk-0.2 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Can anyone help me in resolving this issue because its short of dependency-hell?