I just attempted to upgrade from 10.10 to 11.04 using the synaptic package manager and it crashed towards the end of the process. I'm not sure exactly at what point. I had to reboot the computer (lenovo thinkpad x61s), and now i am only able to log into the command line when i boot up ubuntu. It appears to think it has 11.04 fully installed, but i can't get to the desktop. Any help much appreciated.
closed as off topic by Marco Ceppi♦ Feb 6 '12 at 0:04
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The easiest way to fix an unusable system from an interrupted release upgrade is to wipe your disk and reinstall Ubuntu (whichever version you want to use).
Before doing that, you should offload all your important documents and any other important files (e.g., music, videos, ebooks). You can do that by booting from the same live CD/DVD or live USB flash drive that you'd use to install Ubuntu, selecting Try Ubuntu instead of Install Ubuntu, opening up a Nautilus (file browser) window, finding and mounting the drive for your installed Ubuntu system, and finding and copying the files to an external hard drive or USB flash drive, or to another computer on the network, or emailing them to yourself (or otherwise uploading them to somewhere on the Internet, for example using a service like Ubuntu One).
Then, after making sure you've got all your files offloaded somewhere else, you can run the Ubuntu installer by double-clicking the icon for it on the live CD/DVD/USB desktop, and selecting to install using the entire disk.
You might be able to troubleshoot this problem and fix it without reinstalling from scratch, but doing so would likely take enormously more time and effort than reinstalling from scratch. Furthermore, once such a fix is implemented, it would probably be worthwhile to keep it and see what happens...but something that seems to fix this problem could very well turn out not to be a complete fix, since during a release upgrade, very large changes are made to your system, so some things could still be broken that you'd only find out about later.