网上的几种解决办法都试过了，都没用。
1) Unity 或 Gnome 尝试仅显示灰屏
2) xfce4 可以运行，但是 randr 扩展不存在（它存在并且适用于 Unity）
- tightvnc 已安装
- 所有软件包均已更新至最新版本
- 安装的 supermicro 服务器主板和库存驱动程序
对于 2，我读到的内容表明它与显示驱动程序有关。我正在查看手册，但到目前为止还没有找到答案。有什么想法吗？
编辑日志文件：
22/04/17 10:01:14 Xvnc version TightVNC-1.3.10
22/04/17 10:01:14 Copyright (C) 2000-2009 TightVNC Group
22/04/17 10:01:14 Copyright (C) 1999 AT&T Laboratories Cambridge
22/04/17 10:01:14 All Rights Reserved.
22/04/17 10:01:14 See http://www.tightvnc.com/ for information on TightVNC
22/04/17 10:01:14 Desktop name 'X' (Vgpgpu:1)
22/04/17 10:01:14 Protocol versions supported: 3.3, 3.7, 3.8, 3.7t, 3.8t
22/04/17 10:01:14 Listening for VNC connections on TCP port 5901
Font directory '/usr/share/fonts/X11/75dpi/' not found - ignoring
Font directory '/usr/share/fonts/X11/100dpi/' not found - ignoring
/usr/bin/startxfce4: X server already running on display :1
Xlib: extension "RANDR" missing on display ":1".
gpg-agent[8433]: WARNING: "--write-env-file" is an obsolete option - it has no effect
gpg-agent: a gpg-agent is already running - not starting a new one
(xfce4-session:8425): xfce4-session-WARNING **: gpg-agent returned no PID in the variables
Xlib: extension "RANDR" missing on display ":1.0".
(xfwm4:8435): xfwm4-WARNING **: The display does not support the XRender extension.
(xfwm4:8435): xfwm4-WARNING **: The display does not support the XRandr extension.
(xfwm4:8435): xfwm4-WARNING **: The display does not support the XComposite extension.
(xfwm4:8435): xfwm4-WARNING **: The display does not support the XDamage extension.
(xfwm4:8435): xfwm4-WARNING **: The display does not support the XFixes extension.
(xfwm4:8435): xfwm4-WARNING **: Compositing manager disabled.
(xfwm4:8435): xfwm4-WARNING **: Cannot find visual format on screen 0
Xlib: extension "RANDR" missing on display ":1".
Xlib: extension "RANDR" missing on display ":1.0".
Xlib: extension "RANDR" missing on display ":1.0".
(xfsettingsd:8445): xfsettingsd-CRITICAL **: No RANDR extension found in display :1.0. Display settings won't be applied.
Xlib: extension "XInputExtension" missing on display ":1.0".
(xfsettingsd:8445): xfsettingsd-CRITICAL **: XI is not present.
(xfsettingsd:8445): xfsettingsd-CRITICAL **: Failed to initialize the Xkb extension.
(xfsettingsd:8445): xfsettingsd-CRITICAL **: Failed to initialize the Accessibility extension.
Xlib: extension "RANDR" missing on display ":1.0".
Xlib: extension "RANDR" missing on display ":1.0".
Xlib: extension "RANDR" missing on display ":1.0".
Xlib: extension "RANDR" missing on display ":1.0".
Xlib: extension "RANDR" missing on display ":1.0".
Xlib: extension "RANDR" missing on display ":1.0".
Xlib: extension "RANDR" missing on display ":1.0".
Xlib: extension "RANDR" missing on display ":1.0".
** (xfce4-volumed:8528): WARNING **: Binding 'XF86AudioRaiseVolume' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl>XF86AudioRaiseVolume' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Alt>XF86AudioRaiseVolume' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding '<Shift>XF86AudioRaiseVolume' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl><Shift>XF86AudioRaiseVolume' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl><Alt>XF86AudioRaiseVolume' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding '<Alt><Shift>XF86AudioRaiseVolume' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl><Shift><Alt>XF86AudioRaiseVolume' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding 'XF86AudioLowerVolume' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl>XF86AudioLowerVolume' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Alt>XF86AudioLowerVolume' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding '<Shift>XF86AudioLowerVolume' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl><Shift>XF86AudioLowerVolume' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl><Alt>XF86AudioLowerVolume' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding '<Alt><Shift>XF86AudioLowerVolume' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl><Shift><Alt>XF86AudioLowerVolume' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding 'XF86AudioMute' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl>XF86AudioMute' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Alt>XF86AudioMute' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding '<Shift>XF86AudioMute' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl><Shift>XF86AudioMute' failed!
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl><Alt>XF86AudioMute' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding '<Alt><Shift>XF86AudioMute' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Binding '<Ctrl><Shift><Alt>XF86AudioMute' failed!
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (xfce4-volumed:8528): WARNING **: Failed to map virtual modifiers
** (zeitgeist-datahub:8470): WARNING **: zeitgeist-datahub.vala:229: Unable to get name "org.gnome.zeitgeist.datahub" on the bus!
Failure: Module initialization failed
Xlib: extension "RANDR" missing on display ":1.0".
** (polkit-gnome-authentication-agent-1:8505): WARNING **: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: An authentication agent already exists for the given subject
Cannot register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: An authentication agent already exists for the given subject
xfwm4: Fatal IO error 11 (Resource temporarily unavailable) on X server :1.0.
xfdesktop: Fatal IO error 11 (Resource temporarily unavailable) on X server :1.0.
答案1
这个答案是不要打扰。我改用带有 -X 选项的 SSH。到目前为止似乎好多了。
Wikipedia 还展示了远程桌面的其他几个选项。无需为此烦恼。还推荐了 X2go。