我最初安装 VNC4SERVER 是为了在 AWS EC2 Linux (Ubuntu 12.04) 实例上运行 Guacamole（通过浏览器渲染虚拟机）。它工作正常，然后我关闭了实例。几天后我再次启动它，然后我发现 VNC 无法正常工作。
我进入终端并检查了它，这是日志：
GNU nano 2.2.6 File: /root/.vnc/ip-10-148-67-7:2.log
04/06/13 17:28:46 Xvnc version TightVNC-1.3.9
04/06/13 17:28:46 Copyright (C) 2000-2007 TightVNC Group
04/06/13 17:28:46 Copyright (C) 1999 AT&T Laboratories Cambridge
04/06/13 17:28:46 All Rights Reserved.
04/06/13 17:28:46 See http://www.tightvnc.com/ for information on TightVNC
04/06/13 17:28:46 Desktop name 'X' (ip-10-148-67-7:2)
04/06/13 17:28:46 Protocol versions supported: 3.3, 3.7, 3.8, 3.7t, 3.8t
04/06/13 17:28:46 Listening for VNC connections on TCP port 5902
Font directory '/usr/share/fonts/X11/Type1/' not found - ignoring
Font directory '/usr/share/fonts/X11/75dpi/' not found - ignoring
Font directory '/usr/share/fonts/X11/100dpi/' not found - ignoring
No VNC extension on display :2
gnome-session[3440]: WARNING: GSIdleMonitor: IDLETIME counter not found
gnome-session-is-accelerated: No composite extension.
gnome-session-check-accelerated: Helper exited with code 256
gnome-session[3440]: WARNING: Session 'gnome-classic' runnable check failed: Exited with code 1
GNOME_KEYRING_CONTROL=/tmp/keyring-Qol7F5
GPG_AGENT_INFO=/tmp/keyring-Qol7F5/gpg:0:1
GNOME_KEYRING_PID=3458
有人可以帮忙吗？任何信息或建议将不胜感激。