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I have a computer (laptop) and a hard disk to which I have already created partitions for my Operating Systems and a Boot partition, which has Grub2 and the /boot files.

What is the proper way to install multiple Ubuntu Operating Systems and update GRUB2 to allow me to select which OS to boot? (in my case, the Ubuntu 13.04 Desktop and a minimal server install)

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good question.. thumbs up.. –  Saur.K Aug 29 '13 at 12:46
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As you described you have created separate partition, it is fairly possible to install multiple Ubuntu operating systems and use which ever you want.

While installing Ubuntu just chose the last option Do something else and select the partition in which you want to install Ubuntu. Best thing is that you can chose same Swap partition for all Ubuntu installation.

After finishing installation you may need to use Boot-Repair a very good package to fix/built Grub related issues.

Hope you can understand from this short description.

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I actually managed to boot the server install by using update-grub and then using grub-customizer to fix it by copy-pasting the partition GUID into place. However, this requires a ppa and lot's of manual tweaking, so it is probably not the right way to do it. –  Eero Aaltonen Aug 29 '13 at 12:41
    
pretty cool.. good to know other way also.. –  Saur.K Aug 29 '13 at 12:45
    
It really should work just by running update-grub, but the entries created were wrong. I'm leaving this question in the hope that the right way to do this is found / documented. –  Eero Aaltonen Aug 29 '13 at 12:47
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