Ubuntu12.04 install KDE4.9

KDE4.9 official version has been released (see the http://www.linuxidc.com/Linux/2012-08/67118.htm), currently Ubuntu12.04 has been able to install the official version of KDE4.9: sudoadd-apt-repositoryppa: kubuntu-ppa/backportssudoapt-getupdate if you have a KDE Environment, so

The official version of KDE 4.9 has been released (see the http://www.linuxidc.com/Linux/2012-08/67118.htm), the current Ubuntu 12.04 has been able to install the official version of KDE 4.9:

Sudo add-apt-repository ppa: kubuntu-ppa/backports

Sudo apt-get update

If you already have a KDE environment, update the system directly:

Sudo apt-get upgrade

If not, you can install KDE:

Sudo apt-get kubuntu-desktop

Note: This update is somewhat of a type system update and may replace many dependencies. In addition, it may take a long time (4 ~ 5 hours, not powerful)

For KDE 4.9, see Official introduction: http://kde.org/announcements/4.9/