apache2-mpm-worker not available - installing on Debian etch (VPS container)

[feelgood]

Hi

I just got a VPS container with Debian 4 etch
(kernel 2.6.18-028stab060.8 redhat enterprise)

I have followed the instructions to install ispCPomega on Debian:

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# apt-get update
# apt-get upgrade
# apt-get install tar bzip2 wget lsb-release
# mkdir -p /usr/local/src/ispcp
# cd /usr/local/src/ispcp
# wget http://mesh.dl.sourceforge.net/sourcefor....0.tar.bz2

# cd ./ispcp-*

# apt-get update
# apt-get upgrade
# apt-get install $(cat ./docs/Debian/debian-packages-etch)
--------------------------------------------------------------

And I get this error:
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Building package lists... Done
Building dependency tree... Done
apache2-mpm-worker is not available, but it referred to by another package.
...
--------------------------------------------------------------

Is this related to the non-free repository?
What could I do at this point?

(I used to be fluent in LINUX, but it has been 10 years, I could use a hint)

Thank you