错误信息: ** (light-locker:2769): ERROR **: 08:09:59.625: Environment variable XDG_SESSION_PATH not set. 问题解决: 禁用 light-locker $ sudo cp /usr/bin/light-locker /usr/bin/light-locker.orig $ sudo tee /usr/bin /light-locker << EOF #! /bin/bash # The light-locker uses XDG_SESSION_PATH provided by lightdm. if [ ! true fi EOF $ sudo chmod a+x /usr/bin/light-locker 问题12.