Multi-Boot Live USB

[gold_finger]

@goldfinger-  I have an issue dual booting LL 2.4 and LL2.6. It seems grub is not fully implemnted or something. I get an error when trying to boot from either HDD into the other LL install.

No need for another thread.  Your timing is perfect.  I happen to be in middle of this similar issue with another poster here:  https://www.freecinema2022.gq/forums/insta...windows-7/.  (You don't need to read through all of the posts there.  I'll pick-out relevant points that apply to you below.)

Other poster's problem is with Mint and LL, but the two different LL's in your case are causing same problem.  Why will one that controls booting not boot the other one?  Here's my answer on other thread (reply #13):

It's not that other distros fail to "see or work well with LL".  One or two standard lines in grub code that all distros look to and use to boot others they find was altered/customized in LL -- so they don't work as expected anymore when pointed to by other distros -- causing failure to boot LL.  The change(s) to LL were made to make things easier for new Linux users who dual-boot with Windows.  I don't dual-boot with Windows, so I don't really know what about the menu is "easier" than what one would see without the change(s).

When I first started using Linux and did dual-boot with Windows, I honestly didn't think there was anything particularly confusing or difficult about the grub menu I was seeing -- so not sure if such modifications are really necessary.

Other poster was also combining Windows 7 and EasyBCD into the equation, so there are two possible solutions offered there.  In your case, what you'll need to do is described by austin.texas on the Mint forums here.  Near the bottom of this post of mine I basically just elaborated a bit more on what austin.texas posted to make instructions easier step-by-step.  You can follow those steps by just making a couple of changes.

1. Decide which OS you want to control booting -- LL2.4 or LL2.6?  Where I refer to doing things in Mint, you substitute your controlling LL.
   
2. When you see step with command "gksu gedit /etc/grub.d/40_custom", substitute "leafpad" in place of "gedit".