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I have installed Debian on a Toshiba hard drive and Ubuntu on a Hitachi hard drive on a Fujitsu laptop. Now I'm trying to boot these two systems on a HP laptop, but neither will boot. After a few seconds of black screen, it boots into Windows in HP's hard drive. I've made sure that "USB Boot" is enabled and "Secure Boot" is disabled in HP's boot menu, and HP's hard drive is set to the end of the boot order. All three systems are 64-bit.

When I installed the two Linux systems I had only the corresponding hard drive and the installer USB stick attached to the Fujitsu laptop so I'm pretty sure the boot loaders are in the correct hard drive.

Is there any way I can boot the two Linux systems on both laptops?

closed as unclear what you're asking by Tomasz, Rui F Ribeiro, GAD3R, Stephen Rauch, Romeo Ninov Jul 16 '17 at 20:46

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    This sort of this will be really hard to debug remotely. Is there some reason you don't want to just reinstall your disks in their new home? "Now I'm trying to boot these two systems on a HP laptop, but neither will boot." Please give more details about the hardware setup? Are you saying you have the original HP hard drive(s) in the HP machines, as well as two additional drives from other machines? And are those additional drives installed as internal or external drives? – Faheem Mitha Jul 16 '17 at 8:39
  • Debian, if it has the same hardware detection routines as Ubuntu (and why wouldn't they backport it?), should have no issue booting on different hardware from that which it was originally installed on. If you're using grub2 (again, default on ubuntu) it also should have no issue. First, thing to check would be to see if the Toshiba hard drive contains an EFI partition. It's possible the HP laptop doesn't support EFI booting. – Cliff Armstrong Sep 7 '17 at 3:54
  • To clarify, I actually have Ubuntu 14.04 installed to a portable USB3 hard drive that I use for diagnostics on client computer hardware. It boots on any system that can boot from USB. Other than ensuring it installed with an MSDOS partition table and a bootloader on the MBR I didn't do anything special to make it work, just installed Ubuntu on it normally. – Cliff Armstrong Sep 7 '17 at 3:56
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    Sorry guys, I totally forgot about this post. The problem was solved earlier, turned out HP's legacy boot was turned off. Thanks for all the help. Learned more about Linux boot. – user7065687 Sep 8 '17 at 16:49

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