在Ubuntu启动youdao错误解决方法

启动有道时出现一下错误：

youdap：未找到命令
adolph@adolph:~$ youdao-dict
Traceback (most recent call last):
  File "/usr/bin/youdao-dict", line 27, in
    from dae.daeclient import DAEClient
  File "/usr/share/youdao-dict/dae/daeclient.py", line 36, in
    from dae.window import Window
  File "/usr/share/youdao-dict/dae/window.py", line 30, in
    from dae.shadowwindow import ShadowWindow
  File "/usr/share/youdao-dict/dae/shadowwindow.py", line 28, in
    import dae.xutils as xutils
  File "/usr/share/youdao-dict/dae/xutils.py", line 25, in
    ewmh = EWMH()
  File "/usr/share/youdao-dict/dae/ewmh.py", line 50, in __init__
    self.display = _display or display.Display()
  File "/usr/lib/python3/dist-packages/Xlib/display.py", line 80, in __init__
    self.display = _BaseDisplay(display)
  File "/usr/lib/python3/dist-packages/Xlib/display.py", line 62, in __init__
    display.Display.__init__(*(self, ) + args, **keys)
  File "/usr/lib/python3/dist-packages/Xlib/protocol/display.py", line 129, in __init__
    raise error.DisplayConnectionError(self.display_name, r.reason)
Xlib.error.DisplayConnectionError: Can't connect to display ":0": b'Invalid MIT-

临时解决方法是运行一下命令：
$ sudo xhost +
这样就可以正常启动有道了