Visit http://qt-project.org/, click the Download link.
|Download Qt Open Source versions|
Scroll down to download the file for your system. In my case of Ubuntu 13.04, download Qt online installer for Linux 32-bit.
|download Qt online installer for Linux 32-bit|
|Allow the installer to runs as a program|
The extra steps is quite straightforward:
(for Ubuntu 13.04)
If you reported with the following errors:
error: Qt Creator needs a compiler set up to build. Configure a compiler in the kit options.
Visit Install g++ on Ubuntu
error: cannot find -lGL.
Visit Install OpenGL library