Just tried to upgrade my ubuntu 10.10 using "do-release-upgrade" from console and fails:
Error is:
alex@spse:/# do-release-upgrade Checking for a new ubuntu release Get:1 Upgrade tool signature [198B] Get:2 Upgrade tool [1306kB] Fetched 1307kB in 0s (0B/s) authenticate 'natty.tar.gz' against 'natty.tar.gz.gpg' exception from gpg: GnuPG exited non-zero, with code 2 Debug information: gpg: Signature made Mon Jun 4 09:40:31 2012 EDT using DSA key ID 437D05B5 gpg: Can't check signature: public key not found Authentication failed Authenticating the upgrade failed. There may be a problem with the network or with the server. alex@spse:/#
Any ideas?
Thanks,
Alex
Best Answer
You tried to update to natty (11.04) but 11.04 is EOL since October 28, 2012.
Take a look at this page: https://wiki.ubuntu.com/Releases
This is why you can't upgrade - the package you request doesent exist any more.
I think you have to reinstall with an actual Ubuntu-Version (12.04 or 12.10). Or 13.04 which will be released at the End of April.