Не удается установить Nessus в Ubuntu 14.04 LTS [duplicate]

Я попробовал следующую команду:

sudo apt-get install nessus

Но это показывает:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package nessus 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
However the following packages replace it:
openvas-client:i386 openvas-client

E: Package 'nessus' has no installation candidate

Что теперь делать?