Yesterday I upgraded from 13.10 to 14.04 and I ran into a few problems. Interestingly I upgraded two computers (one of which has identical hardware) before this one and had no problems.
When I booted up after the upgrade the screen was flickering, artifacts were everywhere, the 'theme' and icons looked like they came from a old version of Gnome and the background appeared only on half of one of my monitors (the rest was black and I couldn't even move my mouse on the black area). I have an AMD R9 280x so immediately my thought was that I should purge and reinstall the proprietary drivers. I did the following:
sudo apt-get remove --purge fglrx fglrx-amdcccle fglrx-dev
sudo apt-get remove --purge xserver-xorg-video-ati xserver-xorg-video-radeon
sudo apt-get install xserver-xorg-video-ati
sudo apt-get install --reinstall libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
sudo rm -rf /etc/ati
After a restart the flickering issue was gone and my two monitors appeared to behave mostly ok (only problem is that the CCW I put on my 2nd monitor doesn't survive a restart), but the icons, buttons and theme remain looking like they came out an old version of Gnome. Also, the menu bar appears twice in every window: once in the title bar and once well as below in it's own barHere are some photos to show what I mean (sorry about the quality; I had to take them with my phone because the 'Print Scrn' button has also stopped working after the upgrade):
How can I fix this and get my 14.04 looking as beautiful as it was designed to look?