Dual booting 10.04 & 12.04

Jim Byrnes jf_byrnes at comcast.net
Mon Dec 10 16:02:35 UTC 2012

On 12/09/2012 11:15 AM, Nils Kassube wrote:
> Jim Byrnes wrote:
>> I want to start moving from 10.04 to 12.04 by doing a new install.
>> To avoid downtime and have a fallback position I decided to put
>> 12.04 on a new hard drive.  So I put in the new hard drive and
>> swapped the cables from the 10.04 hard drive to the new one and
>> installed 12.04.  I now realize that constantly swapping the cables
>> will be a PITA and completely forgot about dual booting.
>> 1. Is there a way now to have them both plugged in and dual boot?
> With both drives installed it will boot one of them, whichever that is.
> When you login to that system, start a terminal and run the command

> sudo update-grub

This machine is setup to auto logon. Is that a problem?

> which should add an entry for the other system to the grub menu. Then
> you can select the wanted system at boot time from the grub menu. The
> only disadvantage is that you need to run the command above again each
> time you get a new kernel by an update of the other system.

As this is just a temp fix that should not be a problem.  Thanks for 
pointing that out as I would have been confused in the future when it 
stopped working.

> Nils

Thanks, Jim

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