这是mplayer中出现的提示：
process 5188: D-Bus library appears to be incorrectly set up; failed to read machine uuid: Failed to open "/var/lib/dbus/machine-id": No such file or directory
See the manual page for dbus-uuidgen to correct this issue.
说明dbus没有建立，要安装必要的工具：
# apt-get install dbus-x11
运行 dbus-launch ：
# dbus-launch
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-NppmwvzkGO,guid=da913bff1c5b2676ff432cdc4953a7b6
DBUS_SESSION_BUS_PID=5372
DBUS_SESSION_BUS_WINDOWID=14680065
随后有了一个叫messagebus的新用户，dbus的建立完成了。
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