I am currently trying to install Ubuntu 18.04* onto my old Lenovo Thinkpad L420, but for some reason, despite setting the boot order priority to the USB that the ISO is on, the laptop refuses to do anything but boot to Windows 7. I tried following this PDF guide that Lenovo put out, but the BIOS I have (2.6) does not have the options the guide tells me to use. I've hunted around to find out what BIOS edition I need, but to no avail. I feel like I'm stuck; can anyone help?
Edit: It's 18.04.3 to be precise, edited to fix the typo.
Edit 2: Added picture of diagnostic boot screen. It doesn't show much, to be honest.
151 Answer
Under BIOS Boot Options, you might select Diagnostics to see what it is trying to do if you can look at it quickly before it tries to boot anything.
Make sure that your BIOS menu allows you under "I/O Port Access" to enable USB.
And Yes, F12 is the hot key to access the boot device menu.
Don't worry, your Lenovo L420 is not entangled with UEFI. That's one hot mess to avoid with dual boot configurations!
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