After I upgraded to Ubuntu 12.10 from 12.04, there was low graphics and no Unity. Just the mouse and the wallpaper. So, I got into the terminal via Ctrl+Alt+T, launched Chrome and searched for a solution. As a result, I tried this:

sudo sh amd-driver-installer-12.6-legacy-x86.x86_64.run

It did not work. Then I tried this:

sudo add-apt-repository ppa:makson96/fglrx
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install fglrx-legacy

It did not work too. I removed the repository, got back the the xorg version to 1.13, and tried this:

sudo sh /usr/share/ati/fglrx-uninstall.sh 
sudo apt-get remove --purge fglrx fglRx_* fglrx-amdcccle* fglrx-dev* xorg-driver-fglrx 
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

It did return the screen resolution back, but still no Unity. Is there something what could I do?

My graphics card is:

lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV620 [Mobility Radeon HD 3400 Series]