Upgrade 10.04 LTS to 12.04 LTS fails

Question

I have a test mail server that I tried to upgrade from 10.04 LTS to 12.04 LTS that failed at update-initramfs. It left the test system totally broken.

Initial kernel version: 2.6.32-52 x64

1 - execute: apt-get update to update sources. I have nothing unusual installed via apt-get, I did have Zimbra mail installed, it has it's own installer.
2 - do-release-upgrade

I did not upgrade to the latest package versions using apt-get upgrade nor latest kernel version apt-get dist-upgrade. I'm just wondering if that was the problem. I tested upgrades again with 10.04 virtualized (Citrix Xen) and was unable to duplicate an error.

I need to upgrade 3 production mail servers all running Ubuntu 10.04 LTS (2.6.32-46-server) without crashing. Any suggestion upgrading I'd appreciate. I can't have this happen on a production box.

Screen picture of crash

Is updating directly from a installer disk a possibility? - also have you tried reporting a bug? N.B. probably not off-topic , 10.04 server is still supported until April 2015. And is this test server freshly installed, with no updates? — Wilf, Oct 27 '14 at 15:00
I haven't reported a bug. I could kick myself for not saving the logs. Spent a lot of time looking to see if anyone else ran into this issue. The installation did have updates after the initial installation, nothing after that. — Kent L Nasveschuk, Oct 27 '14 at 17:00

Upgrade 10.04 LTS to 12.04 LTS fails

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