vncserver: The HOME environment variable is not set

解决:
添加runuser 环境:

[Unit]
After=network.service

[Service]
Type=forking
ExecStart=/sbin/runuser -l root -c "/usr/bin/vncserver"

[Install]
WantedBy=multi-user.target

ref:https://www.cnblogs.com/dakewei/p/13580118.html