linux下查看和添加PATH环境变量
http://blog.csdn.net/dlutbrucezhang/article/details/8811456

%add binary path to system
export PATH=$PATH:/home/lara/Profile/elastix/bin (/etc/profile)
echo $PATH
%add .so file to linux(loading shared library)
export LD_LIBRARY_PATH=/home/lara/Profile/elastix/lib (/etc/ld.so.conf)
echo $LD_LIBRARY_PATH

Ubuntu
Create a new file in /etc/ld.so.conf.d/ called .conf
Edit the file and add a line per directory of shared libraries (*.so files), it will look something like:
/usr/lib/APPLICATION/libReload the list of system-wide library paths:sudo ldconfig

install google chrome to your system:
cd /tmp
wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
sudo dpkg -i google-chrome*; sudo apt-get -f install
% 64-bit

linux下如何更新网卡驱动呢？---------内核升级
怕一不小心系统又整崩了连不上网，但是现在网速好差的说。。。。。。
http://www.2cto.com/os/201503/383689.html
http://blog.csdn.net/secondjanuary/article/details/22315127