Where was it noted?
--->>> https://answers.launchpad.net/ubuntu/+source/linux-meta/+question/187166
Hello
I just wanted to note to everyone there is a current known bug with 12.04 in which 12.04 will NOT install on systems without pae.
Also, I have noticed some problems with VMware, thus having to convert a lot of appliances to OVA/OVF and launch in Virtualbox.
Obviously with a new release there will always be issues. However how can you release something as non-beta with a major issue such as inability to install on systems without pae abilities. C'mon boys.
I however did not notice this issue with the new version of Linux Mint. Which makes no sense as both are Debian and Mint is basically Ubuntu but... a little more lame. (I'm a CentOS guy).
So all those that want to convert/upgrade be aware before you blow your arrays or drives.
When a fix is posted I will update this thread.
Cheers!

Chowhound
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