I take my laptop to a friend's home yesterday,his internet connection is  wired connection which the MAC and IP are binded,so I couldn't connect to internet with my laptop at his home unless I modify my laptop's MAC address .I'd never modified the MAC on Ubuntu before,then after I googled and googled,finally I found the ways to modify the MAC on Ubuntu. There are 2 ways to modify the MAC address on Ubuntu :~

As 32 bit system,you need to install some Window codecs to play rmvb & rm format video.For 32 bit system,It is easy to find w32codecs from internet to install,but for AMD-64 version system like Ubuntu 8.10 AMD-64,you might need to spend some time to look for 64 bit codecs-w64codecs. I have a easy way to install w62codecs and libdvdcss2 in 3 minutes as followings :)

How to optimize png format image in command line mode? The answer is Optipng ,Optipng is a simple and useful tool for optimizing png image runs in command line mode.

Arch Linux doesn't offer WMware, and it is difficult to install WMware by compiling source on Arch Linux due to its different service setting in /etc,so we need to install it by yaourt

Kubuntu users probably found  that even you have set up Swiftfox as  default browser on Kubuntu but it won't work.You may try below solution which works for me:

This guide is based on Ubuntu,but it can be a reference for other Linux distributions as well.