KDE 4.0.3 has been released and packages are available for Kubuntu 7.10 and Hardy. They install to /usr/lib/kde4 and can be installed alongside your existing KDE 3.

Instructions:

• For 7.10 add deb http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu gutsy main to your /etc/apt/sources.list


• Install kde4-core, note that PPAs aren't authenticated so you will likely get a warning when installing


• KDE 4 apps should appear in your KDE 3 K-menu or you can run a full session by selecting "KDE 4" from your login manager.