When I tried to upgrade my Ubuntu 12.10:
The operation failed
E:GPG error: http://az-1.hpcloud.mirror.websitedevops.com quantal Release: The following signatures were invalid: NODATA 1 NODATA 2
What's the solution? I need this upgrade.
I have the similar error while using do-release-upgrade and having apt-cacher entries in my source.list.
(Mine just disoplayed my apt-chacher address
I removed the apt-cacher entries from me /etc/apt/source.list and tried to run the upgrade again and this time it didn't give an error.
Still looking for a solution to use apt-cacher to do the upgrade though.
EDIT: I was editing my source.list adding the apt-cacher entries manually to the start of each line, but I found it I add this line to my /etc/ap/apt.conf file
the actual address that is giving the GPG error is displayed now.