I wanna install VirtualBox 4.1 on my ubuntu 11.04 with KDE, But this error occurred during installation.

E: postgresql-common: subprocess installed post-installation script returned error exit status 1
E: postgresql-contrib-8.4: dependency problems - leaving unconfigured
E: postgresql-contrib: dependency problems - leaving unconfigured

where is the problem?and How should I solve this problem?

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You have an error coming from a previous installation, regarding postgresql. Run sudo apt-get -f install to see if it can correct this error. – enzotib Jan 2 at 8:23
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