softeng@softeng:~/virtualbox$ sudo dpkg -i virtualbox-5.0_5.0.10-104061~Ubuntu~trusty_i386.deb
dpkg: considering removing virtualbox in favour of virtualbox-5.0 ...
dpkg: no, cannot proceed with removal of virtualbox (--auto-deconfigure will help):
 virtualbox-qt depends on virtualbox (= 4.3.10-dfsg-1ubuntu5)
  virtualbox is to be removed.

dpkg: regarding virtualbox-5.0_5.0.10-104061~Ubuntu~trusty_i386.deb containing virtualbox-5.0:
 virtualbox-5.0 conflicts with virtualbox
  virtualbox (version 4.3.10-dfsg-1ubuntu5) is present and installed.

dpkg: error processing archive virtualbox-5.0_5.0.10-104061~Ubuntu~trusty_i386.deb (--install):
 conflicting packages - not installing virtualbox-5.0
Errors were encountered while processing:
 virtualbox-5.0_5.0.10-104061~Ubuntu~trusty_i386.deb