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first add extra dnf yum rpm epel repos from oracle and fedora

dnf install

dnf install oraclelinux-developer-release-el8 
dnf install oracle-epel-release-el8
dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

dnf repolist

dnf repolist
repo id                           repo name
epel                              Extra Packages for Enterprise Linux 8 - x86_64
ol8_UEKR7                         Latest Unbreakable Enterprise Kernel Release 7 for Oracle Linux 8 (x86_64)
ol8_appstream                     Oracle Linux 8 Application Stream (x86_64)
ol8_baseos_latest                 Oracle Linux 8 BaseOS Latest (x86_64)
ol8_developer                     Oracle Linux 8 Development Packages (x86_64)
ol8_developer_EPEL                Oracle Linux 8 EPEL Packages for Development (x86_64)
ol8_developer_EPEL_modular        Oracle Linux 8 EPEL Modular Packages for Development (x86_64)

dnf grouplist

dnf grouplist
...
Xfce
...

dnf groupinstall

dnf groupinstall xfce

switch from gdm to lightdm (to stop gdm & gnome-shell killing CPU)

dnf install lightdm
systemctl disable gdm
systemctl enable lightdm

systemctl invoke to graphical ui

(you no longer use runlevel and startx)

systemctl get-default 
systemctl invoke graphical.target

systemctl set-default startup mode

systemctl get-default 
systemctl set-default graphical.target

refs