Useful links: https://www.qgis.org/en/site/forusers/alldownloads.html http://askubuntu.com/questions/351899/qgis-quantum-gis-install-fails-unmet-dependencies http://blog.csdn.net/heybob/article/details/52911395 1. First remove already added repositories which you tried to install Qgis: Execute this in your terminal: sudo software-properties-gtk and go to Other Softwaretab. Then remove those repositories that you added using your mentioned tutorial. Find names similar to http: