CentOS8 delete a lot of packages to address the general idea is to find from the depot CentOS7 or EPEL7 in and resolve dependencies.
For example, to find the EPEL7 have simple-scan package, but found that they depend on gnome-icon-theme, libcolord.so.1 () and libcolordprivate.so.1 () when installed by pkgs.org inquiries that need to be installed separately The other two packages gnome-icon-theme and compat-libcolord1. Of course, if the system is to minimize the installation, the installation may require more packages. According to the dependency, you can try one by one with the yum install command.
Finally, the Server with GUI CentOS8 standard installation, the installation simple-scan method is as follows.
sudo yum install -y http://mirror.centos.org/centos/7/os/x86_64/Packages/compat-libcolord1-1.0.4-1.el7.x86_64.rpm
sudo yum install -y http://mirror.centos.org/centos/7/os/x86_64/Packages/gnome-icon-theme-3.12.0-1.el7.noarch.rpm
sudo yum install -y http://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/s/simple-scan-3.12.2-1.el7.x86_64.rpm
Note: If the above URL is too slow to download, can also be replaced by URL from domestic sites (such as Ali cloud https://opsx.alibaba.com/mirror/search) search package.