how to reinstall KDE in Kubuntu 6.06 LTS?

[Ed Lau]

> Problem is, the system will not install older versions unless you
> force it to.

Yes, I know it. But apt-get does not contain "force install" action:
http://www.die.net/doc/linux/man/man8/apt-get.8.html

But I found this URL -
http://seerofsouls.com/wiki/How-Tos/DowngradingKDE
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Incase you have upgraded to a version of KDE and are having issues and
want to roll back to an older version, here is a quick way to do it.
This will assume you are using a line in your /etc/apt/sources.list
similar to the following:

deb http://kubuntu.org/packages/kde-354/ dapper main

Here is what you need to prepare for the downgrade.

You'll need to edit, or create, a file called preferences in
the /etc/apt/ directory. Do the following commands:

kdesu kate /etc/apt/preferences

Then add the following lines to that file and then save it:

Package: *
Pin: origin kubuntu.org
Pin-Priority: 1001

Then you need to change the sources.list line we showed you above to
match the following:

deb http://kubuntu.org/packages/kde-353/ dapper main

Then perform the following commands:

sudo apt-get update && sudo apt-get dist-upgrade

If you get any errors on packages not installing, then perform the
following command:

sudo apt-get install -f

This should finish the downgrade without any further problems. Once
that is done, perform the following command:

sudo rm -f /etc/apt/preferences

You should now have KDE 3.5.3 installed once again if you followed the
directions exactly as above since we used KDE 3.5.3 as an example.
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Well, it seems like I will try this... No better solution I did not
found.

If it fails, well - then it seems like I need to just reinstall my
computer. Well - I let you know, when I have time to probe this
solution... If there is better solution - you may suggest it.

I found also similar themes:
http://linuxmafia.com/faq/Debian/downgrade.html