Because grub-install in bionic and later also defaults to installing to the removable path, shim-signed in bionic does not need any update for this; the bionic SRUs of grub are only necessary because grub2-unsigned is shared between xenial and bionic.
Because grub-install in bionic and later also defaults to installing to the removable path, shim-signed in bionic does not need any update for this; the bionic SRUs of grub are only necessary because grub2-unsigned is shared between xenial and bionic.