刚在Ubuntu上装了xfce，重启后登录，报错，说没有运行xfce4-panel什么的，无意中解决了，
报错信息：
Because the panel is running in kiosk mode, you are not allowed to make chan
解决方法:
rm -rf ~/.cache/sessions/*
然后设置:
seetings -> seesion and Startup -> General -> Logout Settings
取消勾选Automatically save session on logout
