yum check-update
yum -y install lvm2 device-mapper
yum -y groupinstall GNOME
简简单单三步安装完成，随后设置
查看gdm.service是否启动，发现gdm服务没有启动。
[root@localhost ~]# systemctl status gdm
● gdm.service - GNOME Display Manager
Loaded: loaded (/usr/lib/systemd/system/gdm.service; enabled; vendor preset: enabled)
Active: inactive (dead)
[root@localhost ~]# systemctl enable gdm --now
默认情况，CentOS8默认启动级别为multi-user.target
[root@localhost ~]# systemctl get-default
multi-user.target
下面设置CentOS8的启动级别为graphical.target
[root@localhost ~]# systemctl set-default graphical.target
Removed /etc/systemd/system/default.target.
Created symlink /etc/systemd/system/default.target ¡ú /usr/lib/systemd/system/graphical.target.
[root@localhost ~]# systemctl get-default
graphical.target
再次重启进入即可
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