View Full Version : [ubuntu] Failed Upgrade tool signature

April 13th, 2010, 09:36 AM
I want to upgrade from hardy to karmic. I have followed the intermediate steps and am now in jaunty trying to upgrade to karmic. I am getting this error when I do a sudo do-release-upgrade.

Checking for a new ubuntu release
Failed Upgrade tool signature
Failed Upgrade tool
Done downloading
Failed to fetch
Fetching the upgrade failed. There may be a network problem.

I am behind a proxy. I have searched the web. I am not sure how to solve this problem.