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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.

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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
  • 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!

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  1. Modify the file "/var/lib/update-manager/meta-release" to replace "" to ""

  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 "" to ""

  4. Continue to upgrade

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