Comment 30 for bug 465318

Juan (#29): Agreed. I gave up and decided to re-install 9.04. It took me three full days to get everything working properly again, notwithstanding my extensive notes posted at http://www.astro.uu.nl/~rutten/Recipes_Ubuntu.html, I again had to re-invebt the weel for many tunings. Even the basic reinstall was problematic, the Ubuntu top install website only offers 9.10 and 8.04 "LTS" but trying the latter gave me endless bad-video screens without installation. I then found an .iso for 9.04 and found that one should NOT click on Install, but on "Try Ubuntu without changing your computer", and install only after that has opened, from the install icon that then appears. Now I have a usable computer again and I can lecture again.

So I feel that Ubuntu adds a clicker "update" in the update manager there should also be a clicker "undo update".