小编Pro*_*mma的帖子

以前，我通过以下步骤安装了咖啡因，并且效果很好：

sudo add-apt-repository ppa:caffeine-developers/ppa
sudo apt-get update
sudo apt-get install caffeine

但最近我全新安装了 Ubuntu 14.04，但遇到了咖啡因问题。它安装得很好。但不跑。终端显示以下错误消息：

??[shoumma dell-3442 : ~ ]   
????$? caffeine

(caffeine:7898): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:3398:10: 'filter' is not a valid property name
Traceback (most recent call last):
  File "/usr/bin/caffeine", line 36, in <module>
    ewmh = EWMH()
  File "/usr/lib/python3/dist-packages/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) …