[root@r8t ~]# subscription-manager repos --enable rhel-8-for-x86_64-supplementary-rpms
Repository 'rhel-8-for-x86_64-supplementary-rpms' is enabled for this system.
[root@r8t ~]# dnf groupinstall graphical-server-environment
Updating Subscription Management repositories.
Red Hat Enterprise Linux 8 for x86_64 - BaseOS   25 kB/s | 4.1 kB     00:00
Red Hat Enterprise Linux 8 for x86_64 - AppStre  36 kB/s | 4.5 kB     00:00
Red Hat Enterprise Linux 8 for x86_64 - Supplem  83 kB/s |  97 kB     00:01
no group 'dns-server' from environment 'graphical-server-environment'
No match for group package "hpijs"
Error:
 Problem: package file-roller-3.28.1-2.el8.x86_64 obsoletes file-roller-nautilus < 3.28.1-2 provided by file-roller-nautilus-3.28.1-1.el8.x86_64
  - cannot install the best candidate for the job
  - conflicting requests
(try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
[root@r8t ~]#