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翻译完成20150817 Linux FAQs with Answers--How to fix Wireshark GUI freeze on Linux desktop.md
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Linux FAQs with Answers--How to fix Wireshark GUI freeze on Linux desktop
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================================================================================
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> **Question**: When I try to open a pre-recorded packet dump on Wireshark on Ubuntu, its UI suddenly freezes, and the following errors and warnings appear in the terminal where I launched Wireshark. How can I fix this problem?
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Wireshark is a GUI-based packet capture and sniffer tool. This tool is popularly used by network administrators, network security engineers or developers for various tasks where packet-level network analysis is required, for example during network troubleshooting, vulnerability testing, application debugging, or protocol reverse engineering. Wireshark allows one to capture live packets and browse their protocol headers and payloads via a convenient GUI.
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It is known that Wireshark's UI, especially run under Ubuntu desktop, sometimes hangs or freezes with the following errors, while you are scrolling up or down the packet list view, or starting to load a pre-recorded packet dump file.
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GObject'
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(wireshark:3480): GLib-GObject-CRITICAL **: g_object_set_qdata_full: assertion 'G_IS_OBJECT (object)' failed
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkRange'
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(wireshark:3480): Gtk-CRITICAL **: gtk_range_get_adjustment: assertion 'GTK_IS_RANGE (range)' failed
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkOrientable'
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(wireshark:3480): Gtk-CRITICAL **: gtk_orientable_get_orientation: assertion 'GTK_IS_ORIENTABLE (orientable)' failed
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkScrollbar'
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkWidget'
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GObject'
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(wireshark:3480): GLib-GObject-CRITICAL **: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
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(wireshark:3480): Gtk-CRITICAL **: gtk_widget_set_name: assertion 'GTK_IS_WIDGET (widget)' failed
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Apparently this error is caused by some incompatibility between Wireshark and overlay-scrollbar, and has not been fixed in the latest Ubuntu desktop (e.g., as of Ubuntu 15.04 Vivid Vervet).
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A workaround to avoid this Wireshark UI freeze problem is to **temporarily disabling overlay-scrollbar**. There are two ways to disable overlay-scrollbar in Wireshark, depending on how you launch Wireshark on your desktop.
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### Command-Line Solution ###
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Overlay-scrollbar can be disabled by setting "**LIBOVERLAY_SCROLLBAR**" environment variable to "0".
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So if you are launching Wireshark from the command in a terminal, you can disable overlay-scrollbar in Wireshark as follows.
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Open your .bashrc, and define the following alias.
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alias wireshark="LIBOVERLAY_SCROLLBAR=0 /usr/bin/wireshark"
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### Desktop Launcher Solution ###
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If you are launching Wireshark using a desktop launcher, you can edit its desktop launcher file.
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$ sudo vi /usr/share/applications/wireshark.desktop
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Look for a line that starts with "Exec", and change it as follows.
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Exec=env LIBOVERLAY_SCROLLBAR=0 wireshark %f
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While this solution will be beneficial for all desktop users system-wide, it will not survive Wireshark upgrade. If you want to preserve the modified .desktop file, copy it to your home directory as follows.
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$ cp /usr/share/applications/wireshark.desktop ~/.local/share/applications/
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/fix-wireshark-gui-freeze-linux-desktop.html
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作者：[Dan Nanni][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://ask.xmodulo.com/author/nanni
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Linux 有问必答--如何解决 Linux 桌面上的 Wireshark GUI 死机
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> **问题**: 当我试图在 Ubuntu 上的 Wireshark 中打开一个 pre-recorded 数据包转储时，它的 UI 突然死机，在我发起 Wireshark 的终端出现了下面的错误和警告。我该如何解决这个问题？
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Wireshark 是一个基于 GUI 的数据包捕获和嗅探工具。该工具被网络管理员普遍使用，网络安全工程师或开发人员对于各种任务的 packet-level 网络分析是必需的，例如在网络故障，漏洞测试，应用程序调试，或逆向协议工程是必需的。 Wireshark 允许记录存活数据包，并通过便捷的图形用户界面浏览他们的协议首部和有效负荷。
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这是 Wireshark 的 UI，尤其是在 Ubuntu 桌面下运行，有时会挂起或冻结出现以下错误，而你是向上或向下滚动分组列表视图时，就开始加载一个 pre-recorded 包转储文件。
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GObject'
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(wireshark:3480): GLib-GObject-CRITICAL **: g_object_set_qdata_full: assertion 'G_IS_OBJECT (object)' failed
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkRange'
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(wireshark:3480): Gtk-CRITICAL **: gtk_range_get_adjustment: assertion 'GTK_IS_RANGE (range)' failed
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkOrientable'
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(wireshark:3480): Gtk-CRITICAL **: gtk_orientable_get_orientation: assertion 'GTK_IS_ORIENTABLE (orientable)' failed
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkScrollbar'
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkWidget'
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(wireshark:3480): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GObject'
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(wireshark:3480): GLib-GObject-CRITICAL **: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
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(wireshark:3480): Gtk-CRITICAL **: gtk_widget_set_name: assertion 'GTK_IS_WIDGET (widget)' failed
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显然，这个错误是由 Wireshark 和叠加滚动条之间的一些不兼容造成的，在最新的 Ubuntu 桌面还没有被解决（例如，Ubuntu 15.04 的桌面）。
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一种避免 Wireshark 的 UI 卡死的办法就是 **暂时禁用叠加滚动条**。在 Wireshark 上有两种方法来禁用叠加滚动条，这取决于你在桌面上如何启动 Wireshark 的。
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### 命令行解决方法 ###
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叠加滚动条可以通过设置"**LIBOVERLAY_SCROLLBAR**"环境变量为“0”来被禁止。
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所以，如果你是在终端使用命令行启动 Wireshark 的，你可以在 Wireshark 中禁用叠加滚动条，如下所示。
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打开你的 .bashrc 文件，并定义以下 alias。
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alias wireshark="LIBOVERLAY_SCROLLBAR=0 /usr/bin/wireshark"
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### 桌面启动解决方法 ###
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如果你是使用桌面启动器启动的 Wireshark，你可以编辑它的桌面启动器文件。
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$ sudo vi /usr/share/applications/wireshark.desktop
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查找以"Exec"开头的行，并如下更改。
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Exec=env LIBOVERLAY_SCROLLBAR=0 wireshark %f
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虽然这种解决方法将有利于所有桌面用户的 system-wide，但它将无法升级 Wireshark。如果你想保留修改的 .desktop 文件，如下所示将它复制到你的主目录。
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$ cp /usr/share/applications/wireshark.desktop ~/.local/share/applications/
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/fix-wireshark-gui-freeze-linux-desktop.html
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作者：[Dan Nanni][a]
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译者：[strugglingyouth](https://github.com/strugglingyouth)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://ask.xmodulo.com/author/nanni
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