How to install qt 4.8 from repository?
How to install qt 4.8 and QtCreator from repository ?
qt4-x11
The coming Precise Pagoling is having the Qt 4.8.1, at the moment. The PP will be released: https://wiki.ubuntu.com/PrecisePangolin/ReleaseSchedule -> April 26th.
Backported
The Kubuntu developers ( http://www.kubuntu.org/ )have backported the Qt 4.8 to the Oneiric Ocelot: https://launchpad.net/~kubuntu-ppa/+archive/backports .
PPA
From the Personal Package Archives for Ubuntu: https://launchpad.net/ubuntu/+ppas?name_filter=qt4-x11
Earlier
qt4-x11 4.4.7.0 in Lucid