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as per the title, I want to see how I can make GRUB boot both UEFI and Legacy modes, as I'm currently working on a portable install of Ubuntu on a portable SSD drive I bought.

I do have a Legacy machine, a Lenovo ThinkPad that I locked myself out of its BIOS so it's stuck on Legacy mode, currently running Linux Mint.

How do I do that? the rest of my machines are all UEFI, but my laptop and station can be changed to Legacy mode.

Drive info: Make: Transcend Model: ESD230C Size: 480GB Connection: USB 3.1 Type C

Thanks again!

sgal5208
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    You'll need to install both the BIOS-mode and the EFI-mode versions of GRUB. Beyond that I can't be of much help, since I've never before done this. – Rod Smith Apr 23 '22 at 20:19
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    Full install to flash drive UEFI or BIOS, gpt drive - C.S.Cameron https://askubuntu.com/questions/1217832/how-to-create-a-full-install-of-ubuntu-19-10-to-usb-device-step-by-step You can also search for other posts by C.S.Cameron or sudodus for more info. – oldfred Apr 23 '22 at 20:39
  • So I just run the installer and have a GPT format and just hope that the Legacy machine can boot GPT drives? – sgal5208 Apr 25 '22 at 02:27
  • A true legacy BIOS doesn't know anything about the partition table type; it just reads the first sector of the disk and then executes the code it finds there. Trouble sometimes arises with the CSM/legacy mode in EFIs, which may try to read an interpret the GPT data before this happens; but such computers should be able to boot in EFI mode. See here for more on this topic. – Rod Smith Apr 25 '22 at 14:26
  • Huh. Thanks Rod! – sgal5208 Apr 25 '22 at 23:32

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