I got my Dell Vostro 2520 few days back with Ubuntu 11.10.
I would like to know how I can install Ubuntu 12.04 either fresh (no important data as of now to backup) or as an upgrade as I need to install some software which runs only 12.04.
I tried to upgrade using update manager and I am getting an error like 'Authentication failed. there might be a problem with the server or with the network'. Not sure what this means and how to resolve.
I tried to run from command line and I got some messages as attached in the text file.
Particularly in the last line I got an error saying
"E:Some index files failed to download. They have been ignored, or old ones used instead."
Can some one help me in this. Desparately looking for a solution.
Thanks in advance