E: Package 'virtualbox' has no installation candidate

[kalpana]

i cant install vitual box
when i try
sudo apt update
sudo apt install virtualbox
Code:

Code Select Expand

Package virtualbox is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source


E: Package 'virtualbox' has no installation candidate
what should i do ??