I have managed to put a full Ubuntu install on a USB using a VM like this and know of many tools (such as MultiBootUSB) that can put multiple ISOs on a USB to boot from live but what about multiple full installs? Lets say I want a bunch of different distros fully installed on a USB stick that you can boot from. I know it must be possible as you can have multiple distros on your main HDD and boot to each just fine through grub but how exactly could you do it with a USB? I have messed with grub a little before but not all that much and it sounds like some distros have a different boot sequence than others and so it requires different options in the grub configuration but how does that work exactly? I have a feeling I would have to boot each ISO in a VM and go through the Install process and simply choose something else while going through the partitioning. But how would I do it in a way that would not effect other installations already installed?
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What worked for me:
Created GPT partition table on 32GB flash drive.
Made five ext4 partitions.
Booted Live drive inserted 32GB target drive.
At partitioning selected "Something else".
Chose sdc1 for /.
Installed grub to root of the 32GB drive.
I did this several more times with sdc2, sd3, and different versions of 'Buntu.
After the last install I booted the flash drive and did an update-grub.
Everything seems to work ok for me, what a good idea for a multibooter!
C.S.Cameron
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