As a first step I'd look into whether grub is able to correctly get an IP from DHCP. I wonder if the client class string confuses it.
Could you please take packet captures of the boot attempt? We could then have a look at the whole thing and compare with grub code to see what happens? ** Changed in: grub2 (Ubuntu) Status: Confirmed => Incomplete ** Changed in: grub2 (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1822007 Title: Grub fails to request the /grub/grub.cfg over HTTP when booting with UEFI HTTP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1822007/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs