I run the 64 bit version on my 6 year old laptop that really has too little RAM only 1.5Gb, but it works just fine.
See my signature.
UEFI boot install & repair info - Regularly Updated :
https://ubuntuforums.org/showthread.php?t=2147295
Please use Thread Tools above first post to change to [Solved] when/if answered completely.
I have the same 'problem' - I had a nice working 64bit version running on a HP Z420 (sweet) however something broke when I tried to update my graphics drivers for a NVIDA NVS 310 and I could not boot passed the splash screen. Playing with it only made things worse so I figured I could use the reinstall option. No such luck - 'reinstall' option always greyed (unavailable) and the next option reads the same unreasonable message 'Install Ubuntu 12.10 alongside Ubuntu 12.10'. No other option available to no choice . Fresh installation works again.
Did you have Kernel headers installed.
I think some others had issues and the headers were not updated like they should with a new kernel. So you have to add new kernel headers and reinstall nVidia again to get nVidia to work with new kernel.
Can you boot older kernel?
UEFI boot install & repair info - Regularly Updated :
https://ubuntuforums.org/showthread.php?t=2147295
Please use Thread Tools above first post to change to [Solved] when/if answered completely.
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