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I have 4 Ubuntu version on a system (11.04 and 11.10 both in 32 and 64 bit) and also a few versions of Windows, after a restore now I have the grub from an earlier version and it sees just a system (11.04 32bit).

How can I install grub again and make it see all this Operating Systems?

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up vote 2 down vote accepted

Remove GRUB (sudo apt-get purge grub-pc) from all Ubuntu installations except one (I recommend 11.10 either 32/64 bit). This way, when one of your Ubuntu installations performs a kernel/grub update, it doesn't overlap with the grub configuration of the other.

Also, make sure that you have grub-pc version 1.99+ installed (apt-cache show grub-pc).

After you followed the steps above, run sudo update-grub to let GRUB detect all of your OSes.

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I don't know how to enter in the other systems, I gave sudo update-grub2 from the only linux that was present in the boot menu and it worked. – Eduard Florinescu Aug 27 '12 at 10:26

Grub will automatically detect and set up all your installations. You don't have to do anything, just choose a side-by-side install.

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I have already installed them, but Clonezilla on restore messed up my grub. – Eduard Florinescu Aug 27 '12 at 10:20
Try reinstalling grub. For more info check this site: – Frantique Aug 27 '12 at 12:28

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