Hi all,

I was looking to upgrade my VPS to the latest Ubuntu release this afternoon but ran across a problem. Whenever I try to run "do-release-upgradeā€ I receive the following error:

Checking for a new Ubuntu release
Get:1 Upgrade tool signature [836 B]
Get:2 Upgrade tool [1,265 kB]
Fetched 1,266 kB in 0s (0 B/s)
authenticate 'xenial.tar.gz' against 'xenial.tar.gz.gpg'
gpg exited 1
Debug information:

gpg: Signature made Wed 07 Dec 2016 09:10:01 GMT using RSA key ID C0B21F32
gpg: /tmp/ubuntu-release-upgrader-r7c80csz/trustdb.gpg: trustdb created
gpg: BAD signature from "Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>"

Authentication failed
Authenticating the upgrade failed. There may be a problem with the network or with the server.

Searching online, this looks like it could be a problem with the xenial.tar.gz file on the local repo cache. Has anyone else had similar problems, and if so, how did you resolve them?

I suppose beyond that, has anyone successfully upgraded their Ubuntu VPS to 16.04? Were there any problems along the way?