That's because Mint and several other Ubuntu derivatives use "ubuntu" as the name and directory for an EFI boot. If this was working, selecting ubuntu as you show in your UEFI boot menu would boot Mint.Yes, when I go to the BIOS and go to the boot menu, I get Ubuntu
Have you selected ubuntu in the UEFI menu since you installed Mint? Do you get the same problem? Have you tried going to the BIOS and select boot from EFI file and select the /EFI/ubuntu/grubx64.efi entry? What happens?
Can you use the install USB, boot it and mount the EFI partition on the internal hard drive which shows as sda1 in your boot repair output? You should see several directories there"
If you don't see those directories, particularly the ubuntu directory, you need to reinstall grub.Boot HP Microsoft ubuntu
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