Ubuntu 23.10树莓派环境下Steam启动失败及软件包安装404错误求助

大家好，我刚在树莓派上完成Ubuntu 23.10的全新安装，尝试从启动器打开Steam时，它提示需要安装以下额外软件包：

Steam needs to install these additional packages:
libc6:arm64 libc6:i386 libegl1:arm64 libgbm1:arm64 libgl1-mesa-dri:arm64 libgl1-mesa-dri:i386 libgl1:arm64 libgl1:i386 steam-libs-amd64:amd64 steam-libs-i386:i386

我按回车继续安装后，出现了一系列404错误，具体信息如下：

E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/mantic/restricted/binary-i386/Packages  404  Not Found [IP: 2620:2d:4000:1::19 80]
E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/mantic-updates/restricted/binary-i386/Packages  404  Not Found [IP: 2620:2d:4000:1::19 80]
E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/mantic-security/restricted/binary-i386/Packages  404  Not Found [IP: 2620:2d:4000:1::19 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

Reading package lists... Done
Building depend...

现在Steam没法正常启动，有没有朋友遇到过类似问题？求指点怎么解决这个404错误，顺利安装所需的软件包并启动Steam？

备注：内容来源于stack exchange，提问作者Brendon