apt update not working for container

[faqall]

I have the unifi lxc and when trying to update i receive the following:

Ign:1 http://ftp.nl.debian.org/debian stretch InRelease Hit:2 http://ftp.debian.org/debian bullseye InRelease Hit:3 http://security.debian.org bullseye-security InRelease Ign:4 https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.6 InRelease Hit:5 https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.6 Release Err:6 http://ftp.nl.debian.org/debian stretch Release 404 Not Found [IP: 130.89.149.21 80] Hit:7 http://ftp.debian.org/debian bullseye-updates InRelease Reading package lists... Done E: The repository 'http://ftp.nl.debian.org/debian stretch Release' no longer has 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.

Can someone tell me what I should have in my /etc/apt/source.list?

[tteck]

#1399

Backup, recreate LXC, restore.

[faqall]

Thanks my search didn't net that result. I'll just follow that route. Appreciate ya!