Ubuntu doesn't have the mmc udeb like https://packages.debian.org/unstable/mmc-modules-4.2.0-1-amd64-di in Debian so we can not install Ubuntu into eMMC storage by debian-installer.
Ubuntu doesn't have the mmc udeb like https:/ /packages. debian. org/unstable/ mmc-modules- 4.2.0-1- amd64-di in Debian so we can not install Ubuntu into eMMC storage by debian-installer.