I tried to install the proprietary driver which is available for my graphics card. There are 2 available drivers; "ATI/AMD proprietary FGLRX graphics driver (post-release updates)" and "ATI/AMD ...
I uninstalled propriety ATI driver to check if it would fix wrong Plymouth resolution. It did. But now I cannot reinstall either propriety drivers listed. Also package system has broken with this ...
I know Guitar pro doesn't support 64 bit, but i did get it to work with this command jeggy@jeggy-XPS:~$ sudo dpkg --force-architecture -i GuitarPro6-rev9063.deb [sudo] password for jeggy: Selecting ...