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Ubuntu 10.10 release-upgrade fails

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http://askubuntu.com – 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 (HowTos)