bobisme/gist:5261956

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    Upgrade end-of-lifed Ubuntu installation.

So, apt-get fails you.  What do?
Step 1: Grind through old isos.

Old versions of ubuntu are found here.

Get the alternate version of the iso
Mount and run the script.

wget http://old-releases.ubuntu.com/releases/natty/ubuntu-11.04-alternate-i386.iso

sudo mkdir /media/cdrom
sudo mount -o loop ubuntu-11.04-alternate-i386.iso /media/cdrom
sudo /media/cdrom/cdromupgrade
Step 2: do-release-upgrade

sudo apt-get do-release-upgrade
If that doesn't work, then iterate through the versions using Step 1 until it does.