$ curl https://apt.svc.0x0a.network/public_key.gpg -o 0x0a-network.gpg
$ sudo mv 0x0a-network.gpg /etc/apt/trusted.gpg.d/
$ echo "deb https://apt.svc.0x0a.network unstable lf-os" | sudo tee /etc/apt/sources.list.d/0x0a-network.list
$ sudo apt update
$ sudo apt install lf_os-toolchain lf_os-sysroot
You can remove all usages of sudo when already root, it's left in here to show which commands need root privileges.