The screen package was deprecated in RHEL 7.6 and dropped in RHEL 8.0, though it is still included in the 'Extra Packages for Enterprise Linux' repository. Drawing upon the EPEL Quickstart page, screen can be installed under CentOS / Rocky Linux / AlmaLinux 8 by executing the following commands:
# dnf config-manager --set-enabled powertools # dnf install epel-release
and then the usual apt-get update and apt-get install commands.