我的开发机器是 CentOS 8 虚拟机，我正在尝试在其上安装 docker，因此我可以在本地创建 docker 映像。我基本上在这里遵循 docker 教程：https ://docs.docker.com/engine/install/centos/
我添加了 docker repo，我需要禁用一些包，因为存在冲突。但现在我被困在这部分：
$ sudo yum install docker-ce docker-ce-cli containerd.io
带有以下错误消息：
Running transaction check
No available modular metadata for modular package 'container-selinux-2:2.155.0-1.module_el8.3.0+699+d61d9c41.noarch', it cannot be installed on the system
No available modular metadata for modular package 'fuse-overlayfs-1.3.0-2.module_el8.3.0+699+d61d9c41.x86_64', it cannot be installed on the system
No available modular metadata for modular package 'libslirp-4.3.1-1.module_el8.3.0+475+c50ce30b.x86_64', it cannot be installed on the system
No available modular metadata for modular package 'slirp4netns-1.1.8-1.module_el8.3.0+699+d61d9c41.x86_64', it cannot be installed on the system
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'yum clean packages'.
Error: No available modular metadata for modular package
我试过了$ sudo dnf clean all，$ sudo yum clean packages但无济于事。
我对 yum 和 CentOS 不是很熟悉，所以也许我遗漏了一些微不足道的东西。