As said previously you should upgrade to latest Virtuoso 7.2 release, as discussed in you other top How to install VOS 7.2.x on ubuntu linux, as Virtuoso 6.1 is no longer supported.
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As said previously you should upgrade to latest Virtuoso 7.2 release, as discussed in you other top How to install VOS 7.2.x on ubuntu linux, as Virtuoso 6.1 is no longer supported.