From your boot repair shown in the link in post 19, lines 237 - 241 show you have a BIOS_boot partition with the core.img file needed for a Legacy install on a gpt drive. Line 272 shows the Ubuntu system partition on sda2 and clearly shows a gpt drive on line 291. Line 283 indicates the system firmware seems EFI-compatible but if you can not find any reference to EFI in your BIOS then I expect you will need to do a Legacy install of Ubuntu or another OS. The boot files of [sda2 (end>100GB)] are far from the start of the disk. Your BIOS may not detect them. Having the boot partition at the end of the drive as quoted above from boot repair may be the problem. Might be easier just to reinstall.
Originally Posted by jeremy31 ...People that select to install alongside an old Windows version don't seem to have the issue... Above statement IS the solution to my problem! Thank you Jeremy for pointing this out. Instead of installing just Ubuntu (single boot?), which seems to cause the "Operation System not found" error, a dual boot (Win10 + Ubuntu) installation allows my laptop to automatically boot into Ubuntu without any issue. I can also access the GRUB menu by holding down the SHIFT key during the boot process. I generated another boot info summary for the dual boot installation here: https://paste.ubuntu.com/p/prtrygpYpQ/ It is not obvious to me why boot-repair could not fix the Ubuntu-only boot problem: https://paste.ubuntu.com/p/j372FqcC9h/ Thank you all especially @tea for one for your time and patient with my questions.
Last edited by lang22; November 27th, 2024 at 07:42 PM.
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