upgrade from 11.10 to 12.04 issue.. fails to fetch upgrade tool

[sodoscar]

Hi there,

having a frustrating little problem which I know is got to be a simple fix but i'm buggered if I can make it happen.

When issuing the command:

sudo do-release-upgrade -d

I get the following error:

sod@theta:~$ sudo 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.

This is whats in my /var/lib/update-manager/meta-release for 12.04:

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

A few things to note:

1. I have update-manager installed and current
2. I have followed an upgrade path from 9.10 (10.04,10.10,11.04,11.10) and met this same problem every step of the way. I got around it the last few times by changing updating Prompt=lts to Prompt=normal in /etc/update-manager/release-upgrades and adding the -d switch to the end of the do-release-upgrade command. I might have done other things but my memory fails me here.
3. I have run : sudo apt-get update && sudo apt-get upgrade
4. There is nothing wrong with my network. Everything else works as it should, this server is online and reads other repos without incident.

It has to be the upgrader tool address I'm thinking, but changing the address to point to nz.archive.ubuntu ...etc... doesn't work either.

any ninja's out there know whats up?

[sodoscar]

?

[sodoscar]

Ok for those with similar issues heres what solved my problem:

I am based in NZ and use the NZ mirror site for most of my updates/upgrades/source.

by opening up my apt-sources list:

sudo vi /etc/apt/sources.list

and changing it to point to the main ubuntu mirrors... i.e. dropping the country code prefix, in this case "nz." it now works fine.

I will revert back to the NZ mirrors once the upgrade is completed, so this is just a temporary change, but alas a necessary one in this instance.