Installation failing

[BIRAJ RATH]

Hi, 

I was trying to install osf 3.4 on ubuntu. The installation failed while downloading and installing OWLAPI component. When i am try to re-install , it fails in the Virtuoso installation  step with the error message 

invoke-rc.d: unknown initscript, /etc/init.d/virtuoso-opensource not found.

dpkg: warning: subprocess old pre-removal script returned error exit status 100

dpkg: trying script from the new package instead ...

invoke-rc.d: unknown initscript, /etc/init.d/virtuoso-opensource not found.

dpkg: error processing archive virtuoso-opensource_7.1_amd64.deb (--install):

 subprocess new pre-removal script returned error exit status 100

update-rc.d: /etc/init.d/virtuoso-opensource: file does not exist

dpkg: error while cleaning up:

 subprocess installed post-installation script returned error exit status 1

Errors were encountered while processing:

 virtuoso-opensource_7.1_amd64.deb

Kindly suggest. Let me know the steps to uninstall osf as well.