sudo /snap/bin/ubuntu-device-flash --verbose core 16 --channel edge -o xenial_core_amd64.img --developer-mode --gadget=pc --kernel=pc-kernel --os=ubuntu-core --size=5
Determining gadget configuration
 836.00 KB / 836.00 KB [=======================================================================================================================================================================] 100.00% 1.08 MB/s 0
Partitioning...
Formatting...
Mounting...
Provisioning...
 66.94 MB / 66.94 MB [=======================================================================================================================================================================] 100.00% 3.49 MB/s 19s
Unmounting...
unable to install grub (BIOS): chroot: failed to run command 'grub-install': No such file or directory