如果你直接在rockylinux8中使用yum install screen语句尝试安装screen软件包，你会发现yum报错：

No match for argument: screen
Error: Unable to find a match: screen

这是由于

The utility was marked as deprecated with the release of RHEL 7.6 and was not included as part of RHEL 8.0.（The `screen` package is deprecated and not included in RHEL8.0.0. - Red Hat Customer Portal）

由于rockylinux由centos发展而来，而centos又由rhel源码编译而来，于是rockylinux8顺承了rhel8的大部分（几乎所有）特性。所以你无法在rockylinux8中使用此包。

当然，你可以使用tmux作为替代品，或是使用EPEL 8库进行安装。