CentOS Stream 9
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Desktop Environment : KDE Desktop2022/06/17

If you installed CentOS Stream without GUI but now need GUI because of GUI required applications and so on, Install Desktop Environment like follows.
[1] Install KDE Desktop Environment on this example.
# install from EPEL, EPEL-Next, CRB

[root@dlp ~]#
dnf --enablerepo=epel,epel-next,crb group -y install "KDE Plasma Workspaces"

[2] After installing Desktop, to start Desktop session on CUI, re-login with a common user and run like follows.
[cent@dlp ~]$
export XDG_SESSION_TYPE="wayland exec dbus-run-session startplasma-wayland"

[cent@dlp ~]$
[3] If you would like to change your System to Graphical Login as default,
Change setting like here and restart computer.
Then, Graphical Login screen is shown like follows.
[4] KDE Desktop Session starts.
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