Hard time while installing Plesk 8.x on Ubuntu 6.06 or Debian 3.1

[jules]

Hi,

I have big problems while trying to install Plesk (from 7.5 to 8.x) on a freshly installed linux server.

I have same problems while trying to install it on Ubuntu 6.06 or on Debian Sarge 3.1r4. Thus, Plesk should be ok with those OSes.

Perhaps is there something to do/configure first on my OS?

Additional information:
>My OS:
Linux debian 2.6.8-2-386 #1 Tue Aug 16 12:46:35 UTC 2005 i686 GNU/Linux

>The start of errors I get while trying to install:
resolve packages with apt-get
E: Broken packages
apt-get say following:
Reading Package Lists...
Building Dependency Tree...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
mailman: Depends: pwgen but it is not installable
php5-cgi: Depends: libxslt1.1 (>= 1.1.12) but it is not installable
php5-cli: Depends: libxslt1.1 (>= 1.1.12) but it is not installable
php5-dev: Depends: autoconf but it is not installable