sudo apt-get install binfmt-support qemu qemu-user-static debootstrap
sudo debootstrap --arch=armhf --foreign lunar ./lunar https://mirrors.huaweicloud.com/ubuntu-ports
cd lunar/usr/bin/ ; cp /usr/bin/qemu-arm-static .
sudo update-binfmts --enable qemu-arm
sudo chroot lunar
/debootstrap/debootstrap --second-stage
echo 'Binary::apt::APT::Keep-Downloaded-Packages "1";' | tee /etc/apt/apt.conf.d/10apt-keep-downloads
/etc/apt/sources.list
deb https://repo.huaweicloud.com/ubuntu-ports/ lunar main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ lunar main restricted universe multiverse
deb https://repo.huaweicloud.com/ubuntu-ports/ lunar-security main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ lunar-security main restricted universe multiverse
deb https://repo.huaweicloud.com/ubuntu-ports/ lunar-updates main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ lunar-updates main restricted universe multiverse
deb https://repo.huaweicloud.com/ubuntu-ports/ lunar-backports main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ lunar-backports main restricted universe multiverse
## Not recommended
# deb https://repo.huaweicloud.com/ubuntu-ports/ lunar-proposed main restricted universe multiverse
# deb-src https://repo.huaweicloud.com/ubuntu-ports/ lunar-proposed main restricted universe multiverse