I'm trying to boot into Ubuntu but the problem is that the boot manager menu is not showing me the USB boot option. It says that the system doesn't have any USB boot optiion. How to fix this issue. N.B: I used Rufus to create a bootable flash drive and installed the LTS version of Ubuntu/ My pc brand is Lenovo --> IdeaPad 3 15iau7 so you can say it's a modern laptop/I disabled the secure boot option and still the same problem.
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