After that I manually installed the following components:
by using the "apt-get install component"-command.
After this, my installation succeeded.
Rule #1 - Be Patient - Rule #2 - Don't ask when, if you don't contribute - Rule #3 - You have coding skills - LinuxMCE's small brother is available: http://www.agocontrol.com
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i will not advise you to upgrade the ubuntu versions. install 7.04 and use some tricks discussed here on the forum to run the installer of linuxmce.