2. Install Tools

PC OS	Network	Permission
Ubuntu20.04	online	root

sudo apt-get install git ssh make gcc libssl-dev liblz4-tool expect
sudo apt-get install g++ patchelf chrpath gawk texinfo chrpath diffstat binfmt-support
sudo apt-get install qemu-user-static live-build bison flex fakeroot cmake gcc-multilib
sudo apt-get install g++-multilib unzip device-tree-compiler ncurses-dev libgucharmap-2-90-dev
sudo apt-get install bzip2 expat gpgv2 cpp-aarch64-linux-gnu g++-aarch64-linux-gnu
sudo apt-get install python2 python-is-python3