我已经设置了 ubuntu 存储库，但是当我在客户端服务器上尝试 apt update 或 apt-get update 时，它不起作用。
root@server:/etc/apt# apt-get update
Hit:1 http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy InRelease
Ign:2 http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy-updates InRelease
Err:3 http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy-updates Release
404 Not Found [IP: ]
Ign:4 http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy/universe amd64 Packages
Ign:5 http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy/universe Translation-en
Ign:6 http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy/universe amd64 c-n-f Metadata
Get:4 http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy/universe amd64 Packages [14.1 MB]
Get:5 http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy/universe Translation-en [5,652 kB]
Get:6 http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy/universe amd64 c-n-f Metadata [286 kB]
Reading package lists... Done
E: The repository 'http://ip/ubuntu/mirror/archive.ubuntu.com/ubuntu jammy-updates 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.
root@server:/etc/apt#
错误报告：找不到 release fine 但是 release 文件可用