我在 ChromeOS 上通过 Crouton 运行 Ubuntu KDE，网络管理器似乎没有显示（在 XFCE 上也没有显示）。我尝试运行“未知命令”。我尝试重新安装网络管理器，然后它给了我以下信息：
(precise)mc@localhost:~$ nm-applet
** (nm-applet:31708): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: The name org.freedesktop.NetworkManager was not provided by any .service files
** Message: applet now removed from the notification area
** (nm-applet:31708): WARNING **: Failed to register as an agent: (2) The name org.freedesktop.NetworkManager was not provided by any .service files
** Message: Starting applet secret agent because GNOME Shell disappeared
** (nm-applet:31708): WARNING **: Failed to register as an agent: (2) The name org.freedesktop.NetworkManager was not provided by any .service files
现在图标出现在系统托盘中，呈灰色，表示未启动。有人有什么想法吗？