Unable to configure yardradius and install flash player for Firefox

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http://www.backtrack-linux.org – hi Guys , i have installed New Bt5R3 and i am unable to understand this line when i type " apt-get upgrade" " Setting up yardradius (1.1.2-4) ... yardradius not configured invoke-rc.d: initscript yardradius, action "start" failed. dpkg: error processing yardradius (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: yardradius E: Sub-process /usr/bin/dpkg returned an error code (1) " Can anyone help me out how can i solve this problem??? i tried many ways but i am una (HowTos)