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I have a laptop with a dual boot setup with Ubuntu 10.04 as my primary distro and 9.10 as the secondary distro.

I want to upgrade 9.10 to 12.04 and keep 10.04 as is. Eventually I might want 12.04 to be my primary boot, but not for the time being.

I could just go ahead and upgrade 9.10, but I'm afraid this would interfere with my primary distro.

What is the the best method for achieving what I want?

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How are you achieving this side-by-side installation? – Oliver Salzburg May 2 '12 at 10:30
As shown here-… – nitbuntu May 2 '12 at 10:35

i dont see why upgrading your ubuntu 9 installation should have any effect at all on ubuntu 10. They are 2 different installs on 2 different partitions. One shouldn't affect the other.

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