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This is what I get when trying to upgrade 10.10 Server to Natty.

$ do-release-upgrade 
Checking for a new ubuntu release

Get:1 Upgrade tool signature [198B]                                                                                                       
Get:2 Upgrade tool [182B]                                                                                                                 
Fetched 380B in 0s (0B/s)                                                                                                                 
authenticate 'natty.tar.gz' against 'natty.tar.gz.gpg' 
exception from gpg: GnuPG exited non-zero, with code 1
Debug information: 


gpg: Signature made Thu 20 Oct 2011 10:58:12 BST using DSA key ID 437D05B5
gpg: /tmp/update-manager-bkM3OS/trustdb.gpg: trustdb created
gpg: BAD signature from "Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>"

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

I am using apt-cache proxy defined in /etc/apt/apt.conf.d/90-apt-proxy.conf

apt-get update/upgrade is working normally (using proxy apt proxy)

Server doesn't have direct Internet connection.

No X installed.

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 10.10
Release:    10.10
Codename:   maverick


# uname -a
Linux Host1 2.6.35-30-server #56-Ubuntu SMP Mon Jul 11 21:37:42 UTC 2011 x86_64 GNU/Linux

Any help will be appreciated.

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closed as too localized by Jorge Castro, Eric Carvalho, Eliah Kagan, hhlp, gertvdijk Feb 1 '13 at 19:56

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This question appears to be abandoned and unanswered, if you are experiencing a similar issue please ask a new question with details pertaining to your problem. If you feel this question is not abandoned, please flag the question explaining that. –  Aditya Jan 31 '13 at 15:04