Linux 关机缓慢，按 Esc 键发现卡在 a stop job is running for session 3 of user ubuntu (1 min 30 s)
解决方法
sudo nano /etc/systemd/system.conf
DefaultTimeoutStopSec=10s
sudo systemctl daemon-reload
来源：oschina
链接：https://my.oschina.net/lanseyujie/blog/4311063