Weston (Wayland) Windowing System on Jetson Nano

Hi, I want to use Weston for Jetson Nano.
I tried as https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide%2Fwindow_system_wayland.68.1.html%23, but the “apt-get update” command failed:
root@aither-ubuntu:/# apt-get update
Ign:1 http://ports.ubuntu.com/ubuntu-ports disco InRelease
Hit:2 http://ports.ubuntu.com/ubuntu-ports bionic InRelease
Hit:3 http://ports.ubuntu.com/ubuntu-ports bionic-updates InRelease
Hit:4 http://ports.ubuntu.com/ubuntu-ports bionic-backports InRelease
Hit:5 http://ports.ubuntu.com/ubuntu-ports bionic-security InRelease
Err:6 http://ports.ubuntu.com/ubuntu-ports disco Release
404 Not Found [IP: 2001:67c:1360:8001::22 80]
Reading package lists… Done
E: The repository ‘http://ports.ubuntu.com/ubuntu-ports disco Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Then the “apt-get install eglexternalplatform-dev libnvidia-egl-wayland-dev” command failed, and “git clone ssh://@partner-review-01:13150/bsp/…” also failed.

Please tell me how solve this two problem.

Thanks you,
Best Regards,

Please refer to