CentOS Stream 9
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Desktop Environment : GNOME Desktop2022/01/18

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 GNOME Desktop Environment on this example.
[root@dlp ~]#
dnf -y group install "Server with GUI"

[2] After installing Desktop, to start Desktop session on CUI, re-login with a common user and run like follows.
[cent@dlp ~]$
[3] Or 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] When initial login for each user, they should select language or keyboard settings. After configuring initial login settings, GNOME Desktop session starts like follows.
[5] On RHEL 9 / CentOS Stream 9, GNOME Shell is set default, however if you would like to change to Classic mode like RHEL 7 / CentOS 7, then Click the icon that is placed on the left side of [Sign In] button on the login screen and Select [Classic] on the selection like follows.
[6] GNOME Desktop Classic Session starts.
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