I tried ubuntu a few years ago and had to give up. I thought I'd give it another try and installed 10.4 lts. on a spare machine. I was looking around and things were familar. I was informed that there was an upgrade available and so went for it. After the upgrade to 12.04 lts all I have now is a column of small icons down the left of the screen and nothing else works. Any ideas anyone or should I reinstall 10.04 lts. I am completely new so don't know what I am doing.