Before installing Virtual box i installed Vbox guest addition version 2.2 and know i am unable to install Virtual box version 5.1. it gives conflict error massage. i tried to uninstall Vbox guest addition package with
sudo apt-get remove Vbox guest addition.iso
but it can't removed the package from the directory.
I think the solution may be installing lower version or compatible virtual box version with Vbox guest addition or upgrading the Vbox guest addition version. i don't know how to do this please can i have your help.