root@helios:/home/likwid/Downloads# dpkg -i virtualbox-4.1_4.1.4-74291~Ubuntu~oneiric_i386.deb
dpkg: regarding virtualbox-4.1_4.1.4-74291~Ubuntu~oneiric_i386.deb containing virtualbox-4.1:
 virtualbox-4.1 conflicts with virtualbox
  virtualbox-4.0 provides virtualbox and is present and installed.
dpkg: error processing virtualbox-4.1_4.1.4-74291~Ubuntu~oneiric_i386.deb (--install):
 conflicting packages - not installing virtualbox-4.1
Errors were encountered while processing:
 virtualbox-4.1_4.1.4-74291~Ubuntu~oneiric_i386.deb