When I tried to install virtual box in Ubuntu it showed up an error. It says
dependency is not satisfiable: lib 9th - network (<>=4:4.5.3)
Please let me know how to handle this error.
(Assuming you are using the .deb download).
Use the following command to install virtualbox (It will automatically download vbox and all dependencies):
sudo apt-get install virtualbox-qt
It will prompt you for your password, then for confirming installation (just enter y).
lib 9th
doesn't seem to be a valid name. You can copy command and its full output.