What commands are you running and what do you expect to happen that does not?
If you've installed via subiquity then you can use:
/usr/lib/grub/grub-multi-install
which is what it used during the install to mount and mirror the primary esp to secondary devices.
What commands are you running and what do you expect to happen that does not?
If you've installed via subiquity then you can use:
/usr/lib/ grub/grub- multi-install
which is what it used during the install to mount and mirror the primary esp to secondary devices.