http://blog.csdn.net/huyisu/article/details/24014407
1、在官网下载地址下载：
http://qt-project.org/downloads
根据自己需要下载。
我下载的是：
qt-opensource-linux-x64-5.2.1.run
2、ct+alt+t，快捷键打开终端，进入下载目录下，执行：
./qt-opensource-linux-x64-5.2.1.run
然后就是常规安装了。
下载方法参考如下：
I finally managed to do it,
to uninstall, I managed go to the installation directory, there is an executable called MaintenanceTool, we need to run it, in order to uninstall and remove Qt.
what to do:
open terminal,
go to the installed directory, and then
run MaintenanceTools by the following command
./MaintenanceTool
and it is done.....
也就是打开终端，进入到安装目录下，找到
MaintenanceTool这个工具，执行就ok了。