It seems that grub_disk_open() returns GRUB_ERR_UNKNOWN_DEVICE when it receives EACCESS. I suggest working with upstream to address this issue if this interests you, as I don't think fixing this is a priority for us, since users normally do not run grub-install themselves.
It seems that grub_disk_open() returns GRUB_ERR_ UNKNOWN_ DEVICE when it receives EACCESS. I suggest working with upstream to address this issue if this interests you, as I don't think fixing this is a priority for us, since users normally do not run grub-install themselves.