Re: Dual boot (XP) & 12.04, Ubuntu no boot
That sounds like possible hardware issue too.
As for reinstalling over the existing partitions, you need to do that with manual partitioning, not with the auto methods in the installer. Although it seems in 12.04 there is an option to install over existing ubuntu installation, but I have never tried it.
Sometimes if the bootloader grub2 doesn't install correctly, it can keep the old one on the MBR which will be broken, because the old installation is deleted. In that case you can simply reinstall grub2 to the MBR, no need to reinstall whole of ubuntu again.
Darko.
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Ubuntu 18.04 LTS 64bit
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