paras-d@Paras:~$ sudo dpkg --remove --force-remove-reinstreq virtualbox virtualbox-qt virtualbox-5.1
[sudo] password for paras-d: 
dpkg: warning: ignoring request to remove virtualbox, only the config
 files of which are on the system; use --purge to remove them too
dpkg: warning: ignoring request to remove virtualbox-qt, only the config
 files of which are on the system; use --purge to remove them too
dpkg: warning: overriding problem because --force enabled:
dpkg: warning: package is in a very bad inconsistent state; you should
 reinstall it before attempting a removal
(Reading database ... 212433 files and directories currently installed.)
Removing virtualbox-5.1 (5.1.10-112026~Ubuntu~xenial) ...