Your boot partition has the correct flags but is calling a different bootloader and it fails. See line 46, it should be calling grubx64.efi (not shim) For Ubuntu, the pathname is \EFI\Ubuntu\grubx64.efi
(shimx64.efi is for secure boot).
You may have to create another boot entry. Play with the BIOS settings and tell it to use the ubuntu path I wrote above. Also, you have network boot enabled for ipv4 and ipv6, you dont need them.