Seems to be related to https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1025555 , which says:
/quote CONCLUSION: - grub-efi 32bits always creates invalid entries. - Installing Ubuntu32 bits on an EFI system should be blocked by Ubiquity (the Ubuntu installer). In this case, Ubiquity should ask the user to install Ubuntu64 instead. /unquote -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1173527 Title: make the i386 *buntu version check for UEFI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1173527/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs