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New distros have the PAE kernel. I have Ubuntu 12.04 but I cannot install it on my computer.
I have Core2Duo 7500 processor which is far more powerful than
the requirement. But I have to use the old distros becase it does not
support PAE. I don't expect any solution but I think that PAE kernels
should also support non-PAE processors like Windows.
non-PAE processors are not that old.
What actually is the error you get when booting the kernel?
As I read on wikipedia: Most distributions come with PAE cause it's needed for the NX-Bit. Might that be the cause?
Does the mobo need that feature too? Does it has to be enabled in BIOS?
Virtualization is always somewhat of a deceiver. It tries so hard to give the illusion that "this is a real machine!!" ... that sometimes you forget that it is not. But the Linux operating-system kernel is one of those "edge cases" that can surprise you ... simply because it is so configurable to the needs of, ummmm,real hardware. Every virtualization scheme has to "overlook something," in order to "come acceptably close." But Linux kernels can nevertheless catch them out.
I was able to run 12.04 in VM as well as live CD. Thanks to all especially TobiSGD and Didier for pointing it out that Core2Duo has PAE feature.
Otherwise I would never have installed PAE kernel.
And also I had not asked any question but got a solution.