Plesk install fails on ubuntu 8.04 x64

[luka]

Tried a fresh plesk 9 install on a fresh ubuntu 8.04 machine.
ERROR: It seems there is a user with UID=110
in this system, but Plesk needs the same UID
for its operation.
Unfortunately, this situation has not yet been
resolved.
Please, visit http://www.parallels.com/support for assistance.

Exiting...

That seems to be the UID of the polkituser which is added by the ubuntu installation.I probably just can't go changing it's UID to something else.
Can anyone help?

 

[luka]

ah sorry...seems i posted the question again(didn't notice the first time it actually did get posted).
still need help though