一、下载 http://www.tcpdump.org/#latest-release，下载libcap-1.8.1.tar.gz, 解压缩之后
错误１: ./configure
checking for getifaddrs... yes checking ifaddrs.h usability... yes checking ifaddrs.h presence... yes checking for ifaddrs.h... yes checking for socklen_t... yes checking for getaddrinfo... yes checking whether to build optimizer debugging code... no checking whether to build parser debugging code... no checking whether we have DAG API headers... no checking whether we have Septel API headers... no checking whether we have Myricom Sniffer API... no checking whether TurboCap is supported... no checking for flex... no checking for lex... no configure: error: Neither flex nor lex was found.
核心错误信息为：
error: Neither flex nor lex was found.
解决办法： sudo apt-get install flex bison
Reading package lists... Done Building dependency tree Reading state information... Done The following package was automatically installed and is no longer required: linux-image-extra-4.4.0-34-generic Use 'sudo apt autoremove' to remove it. The following additional packages will be installed: libbison-dev libfl-dev Suggested packages: bison-doc The following NEW packages will be installed: bison flex libbison-dev libfl-dev 0 upgraded, 4 newly installed, 0 to remove and 7 not upgraded. Need to get 900 kB of archives. After this operation, 2,692 kB of additional disk space will be used. Do you want to continue"htmlcode">checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for pcap_open_live in -lpcap... no error: pcap library not found!问题解决：
sudo apt-get install libsqlite3-dev libpcap-dev然后重新尝试新的命令，即可解决上述错误
二、中文模式下切换回英文模式？
修改/etc/default/locale文件的语言值。
将LANG zh_CN.UTF-8修改为en_US.UTF-8 , LANGUAGE zh_CN:zh修改为en_US:en
三、英文模式下开机自动启动IBUS中文输入法。
英文模式下，ibus不能自动启动。每次输入中文都得手动启动。这个让人不能接受。google一下，两种方法。
方法1：system settings->Languange-support->keyboard input method system ->ibus
这种方法我没试验成功。如图所示，选择了没有保存按钮。我以为是默认保存的。但是关了在打开发现还是没有选择上。有可能语言包没有按完整的语言，每次进入语言设置，都会提示语言包没有安装完整。
方法2：添加ibus设置为开机启动的应用
system->preferences->startup application
-d 的意思是让ibus在后台运行
总结
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