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

[feelgood]

I created the file and did apt-get update, and OH NO!...

Code:

...
Get:39 http://ftp.de.debian.org lenny/contrib Packages [76.8kB]
Get:40 http://ftp.de.debian.org lenny/non-free Packages [102kB]
Fetched 12.0MB in 4m17s (46.7kB/s)
Reading package lists... Error!
W: GPG error: http://ftp.debian-unofficial.org etch Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 394D199524C52AC3
W: GPG error: http://www.debian-multimedia.org etch Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907
E: Dynamic MMap ran out of room
E: Error occurred while processing sqlrelay-sqlite (NewVersion1)
E: Problem with MergeList /var/lib/apt/lists/ftp.de.debian.org_debian_dists_lenny_main_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.

Gosh!

I think I am going to get a Plesk cpanel for my etchy VPS.
It is just EUR 2.00 / month.

I thought it would be cool to install my own panel, but it seems it will take me too long to get this stable.

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Thanks a lot for your help, alecksievici.
I have learned something with your comments.

If you or anybody else understands what is going on with my etch VPS container, please do post. I will give it another try.