Trusty's livecd-rootfs also already carries the fix here to not copy again over grub's images, and use grub-install:
https://launchpad.net/ubuntu/+source/livecd-rootfs/2.208.14 "* ubuntu-cpc: Remove redundant copy of grub files." ** Changed in: livecd-rootfs (Ubuntu Trusty) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1637290 Title: Update to the signed 0.9+1474479173.6c180c6-1ubuntu1 shim binary from Microsoft To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1637290/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
