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?