Installing on Ubuntu using Kamal's PPA on "launchpad"

Open a terminal window

Enter the following set of commands (the $ is the command line prompt).

$ sudo add-apt-repository ppa:kamalmostafa/fldigi
$ sudo apt-get update
$ sudo apt-get install fldigi

And you are done.  Fldigi will be installed and a new item added to your window manager's applications menu.  Once you've added
the PPA, you will automatically get updated versions from the PPA as well, along with regular system package updates.

Thanks Kamal.