warning:root:file 'precise.tar.gz.gpg' missing

Question

Firstly I tried to install the 12.04 upgrade via the update manager GUI from 11.10 after there was no more updates to install and after a fresh reboot but all that would happen is it would say downloading release upgrade tool then that it is nothing else.

So I tried running this from the terminal\command line

brown@brown-Ubuntu:~$ update-manager -d
brown@brown-Ubuntu:~$ do-release-upgrade
Checking for a new ubuntu release
Err Upgrade tool signature                                                     
  Connection failed                                                            
Get:1 Upgrade tool [5612 kB]                                                   
Fetched 5612 kB in 0s (0 B/s)                                                  
WARNING:root:file 'precise.tar.gz.gpg' missing
Failed to fetch
Fetching the upgrade failed. There may be a network problem. 

Can someone please help me out here.

Answer 1

So I've found sorta workaround:

• Open /var/lib/update-manager/meta-release, and find strings:

Dist: precise
Name: Precise Pangolin
Version: 12.04 LTS
Date: Thu, 26 Apr 2012 12:04:00 UTC
Supported: 1
Description: This is the 12.04 LTS release
Release-File: http://archive.ubuntu.com/ubuntu/dists/precise/Release
ReleaseNotes: http://archive.ubuntu.com/ubuntu/dists/precise/main/dist-upgrader-all/current/ReleaseAnnouncement
ReleaseNotesHtml: http://archive.ubuntu.com/ubuntu/dists/precise/main/dist-upgrader-all/current/ReleaseAnnouncement.html
UpgradeTool: http://archive.ubuntu.com/ubuntu/dists/precise/main/dist-upgrader-all/current/precise.tar.gz
UpgradeToolSignature: http://archive.ubuntu.com/ubuntu/dists/precise/main/dist-upgrader-all/current/precise.tar.gz.gpg

• Download UpgradeTool and UpgradeToolSignature files
• Upload them to any other web-server and modify corresponding strings (I guess that even file:/// will work)
• sudo do-release-upgrade

Worked for me, hope'll help you either. Good luck!

Answer 2

1. Modify the file "/var/lib/update-manager/meta-release" to replace "archive.ubuntu.com" to "old-releases.ubuntu.com"

2. Run "do-release-upgrade"

3. When it paused at "Third party sources disabled", open another ssh session to modify "/etc/apt/sources.list" and replace "archive.ubuntu.com" to "old-releases.ubuntu.com"

4. Continue to upgrade