I messed up during my OS installation and lost the root password. I need to boot off a USB disk to fix it or reinstall but I cannot. I see the USB drive in the bios menu but it doesn’t show up in the boot manager when I press F12 during boot.
This is the exact same USB decide and disk image i used to install linux earlier. Secure boot is disabled and i tried only plugging in the device once I was in the F12 boot menu.
I’m sorry I must not have been clear in my post. I can get to the EFI boot menu but the USB device is no longer showing up in it. However, the USB device does show up in the bios menu.
I have disabled secure boot (which I had to do initially to get the machine to boot off USB when I installed my OS) and I have tried every combination I can think of as far as when to plug in and/or unplug/replug the USB device at different points in the boot process and the EFI boot menu.
The ISO needs to be exactly right for the installation to work. In my experience they typically download just fine, but I’ve had a few cases where the file was messed up somehow. That’s why typically an ISO is presented with a checksum (usually sha256) so you can verify the image was downloaded perfectly intact.