[ltp] Booting from thumbdrive...
D. Hugh Redelmeier
hugh at mimosa.com
Wed Aug 26 15:34:54 CEST 2020
I'm confused by the cumulative presentation of the information, so I'll
dump what I know that might be relevant. And some that isn't.
Because something has gone wrong, I recommend that you double-check all
kinds of assumptions.
- Not all ISOs can be dd'ed to a thumb drive and booted. That involves
tricks that various distros have adopted at different rates.
test: Can you boot this particular USB, as it is now, on another system
in legacy mode?
- I've had systems where booting into Windows (accidentally, due to typing
F12 too slowly) with a Linux installation USB plugged in, actually
screwed up the contents of the USB. It was repeatable. Horrible.
I blame Windows.
Suggestion: see if your USB content is exactly what you put there
(cmp instead of dd).
- does the Linux on the USB have a self-check option? One that verifies
the contents of the USB? (Fedora does and I find that very useful and
comforting.) If so, try going through the self-check of this USB on
a machine that is willing to boot it.
- in the firmware setup screen of your ThinkPad T450 (it is not a BIOS!)
check to see if you have disabled booting from the USB port. I'm pretty
sure that there is at least one or more options with this effect. It's
considered a security feature.
- Is Windows booting in UEFI or Legacy mode? All systems installed on a
disk should boot in the same mode. Given a choice, I actually prefer
UEFI to Legacy. Each regime has quirks/stupidities.
- in the firmware setup, have you enabled CSM? You need it. I would hope
that it would automatically be enabled with Legacy Mode, but it is worth
- I (mostly and frequently) install Fedora. They've got booting from a
USB stick down well. Consider downloading it and trying to boot it as a
live system (without installing).
That's a lot of work for a small test but you've been struggling with
this problem for a while. Bonus: a USB with a bootable live Linux is
useful in a number of recovery situations.
- can Windows see (not read) the flash drive?
- have you tried a different USB port?
- some firmware systems don't offer a boot choice if they don't see
something bootable on that device. This may only apply to UEFI since it
isn't really possible to make that determination for Legacy mode.
(UEFI requires at least a populated ESP (EFI System Partition with a FAT
Do tell us what you find.
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