How to install KDE 4.2 on KUbuntu 8.04?

instructions to install KDE 4.2 are here:

http://www.kubuntu.org/news/kde-4.2

Nope. I already saw that.
That upgrade only applies to KUbuntu 8.10 (Intrepid) and 9.04 (Jaunty).

follow the installation guide like normal, but inplace of the line:

deb http://ppa.launchpad.net/kubuntu-experimental/ubuntu intrepid main

use:

deb http://ppa.launchpad.net/kubuntu-experimental/ubuntu hardy main

Nope. Already tried.
It looks like it will install 4.0.5 and not 4.2.
Could you confirm it will install 4.2?

sorry i didnt try it, I just thought it may work. i have Kubuntu 8.10 in virtualbox, and it updated to 4.2 successfully. any reason you dont want to upgrade to 8.10?

It's not 8.10 itself. It's KDE 4.
I use Linux+KDE for work and productivity, not spare time or amateur things, so have little time to play with settings, whistles and bells.
I already tried 8.10 and related KDE 4.0 but got in troubles with bluetooth, networkmanager, the panel and the task bar as well as a number of other things and settings which I was supposed to migrate by hand. Not to count how different KDE v3 is from v4 as far as "user experience".
I've read that KDE 4.1 was not suitable for me ("it's for early adopters") and have skipped that and was hoping for v4.2.
I can spend a hour or two to install and test v4.2 on my existing system, but cannot invest a day or two to make things work.
So the question: how to install v4.2 on Ubuntu 8.04. And the incredible answer is: no way.

Provided the lack of any feedback on this topic, I would warn Ubuntu engineers against KDE v4.
KDE v4 will be the future, but not yet.

>So the question: how to install v4.2 on Ubuntu 8.04. And the incredible answer is: no way.

because you cannot find prebuilt packages for your distro? that hardly means that kde4.2 cannot be installed on a system running kubuntu 8.04

does kde nightly still work?

http://www.cyberciti.biz/faq/ubuntu-linux-install-kde-42/
deb http://ppa.launchpad.net/project-neon/ubuntu hardy main

I wouldn't say that compiling from sources is a good way to have software at the mainstream version in LTS. But maybe I'm wrong.
Project-neon is for intrepid, not hardy. For this release there's no KDE4 package and even no amarok-nightly available.
The best I can get for hardy is 4.0.5 from http://ppa.launchpad.net/kubuntu-experimental/ubuntu.
And I already know (because I tried it) 4.0.5 is too experimental for an every-day-user like myself.

So I'm forced to stay sticked with 8.04 and KDEv3 because:
1. Under 8.04 LTS I cannot install the *current KDE v4.2*
2. Under 8.10 I cannot install KDE v3.5.10 in the case v4.2 turns out not to be suitable to me.

I could work those constraints around if I had enough resources to compile everything (from libraries to applications) from sources.

I took my courage with both hands and did it.
I reinstalled my system with Ubuntu 8.10 (GNOME desktop I mean) from scratch.
It's really a pity, but it seems that the stable KDE (v3) is out of any support, while the new one (v4) is far from stability, at least accordignly to my own personal idea of stability.
Maybe in the future I'll turn back to KDE.
Thanks to everyone who tried to help me.