I was upgrading my ubuntu 12.10 to 13.04, using following command:
everything is OK until I get following error message :
Could not download the upgrades The upgrade has aborted. Please check your Internet connection or installation media and try again. All files downloaded so far have been kept. Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/a/account-plugins/account-plugin-facebook_0.10bzr13.03.26-0ubuntu1.1_amd64.deb Size mismatch Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/f/friends/friends-facebook_0.1.3daily13.04.17.1~13.04-0ubuntu1_all.deb Size mismatch Restoring original system state Aborting Reading package lists... Done Building dependency tree Reading state information... Done Building data structures... Done
what should I do for this?