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Re:After 10 years in tech isolation, I’m now outsider to thi... by nihil75 on Wednesday June 10, 2020 @10:18AM (#23477251)
It's both SecureBoot and UEFI.

He's probably preparing the thumbdrive the old-fashion way, jusr dd'ing the iso into it. You need a modern prep tool that's UEFI-compatible for it to boot on new hardware.

Re:After 10 years in tech isolation, I’m now outsider to thi... by cl3misch on Wednesday June 10, 2020 @05:56PM (#23482612)
Maybe I'm missing something, but (apart from Secure Boot) I used dd to create bootable Linux USBs and booted into UEFI just fine. At least on recent Ubuntu images.
Re:After 10 years in tech isolation, I’m now outsider to thi... by coffeecat on Thursday June 11, 2020 @01:28AM (#23485469)
Yes, I've done Linux installations on UEFI hardware using dd'ed iso images. What are these modern prep tools, and what could they possibly be doing that dd can't do?