I am helping out a few people with migrating from Windows XP to Ubuntu (mostly Lubuntu). On one machine, a Dell Latitude D505 (Celeron procerssor), I was also given the PAE error message when booting with Lubuntu 14.04 Beta 2:
(PAE can potentially be enable with Kernel parameter
"forcepae" -this is unsupported, may cause unknown
problems ,and will taint the Kernel)
Trying booting with the forcepae option resolved this, and I am just about to go ahead and install this early Lubuntu 14.04 as replacement for Windows XP (before Tuesday).
But given I use this workaround that will "...taint the Kernel...", I feel slightly uncomfortable about how this will work when 14.04 is being updated. What happens when kernel updates are pushed out? Do I need to be concerned when handing this machine over with this installation? Is the option simply only needed during initial installation and never during updates (especially of the kernel)?