Originally Posted by sirnose
I have found and downloadet dvb apps but cant install it
You have to stop thinking like a Windows person. You do not download a file then install it, you use a package manager.
From the top toolbar
System -> Administration -> Synaptic Package Manager
Put in your password when prompted.
Use the search button (not quick search) to look for dvb-apps then click on the empty box on the left of the entry and click on Mark for Installation
Then click on Apply in the same toolbar as search. The program will be downloaded and installed in one go.
Then search just for DVB and you will find a wonderland of Digital TV applications.
ps. You can install a downloaded app using GDebi from inside Nautilus but I suggest you leave that alone for now until you know more about Linux and Ubuntu.