Open up the "Synaptic Package Manager":
System -> Administration -> Synaptic Package Manager
Bring up the "Software Sources" dialog in the "Synaptic Package Manager":
Settings -> Repositories
Select the "Other Software" tab in the "Software Sources" dialog, click the "+Add" button.
In the "APT line: " text input box type:
ppa:alexey-smirnov/deadbeef
Click the "+Add Source" button, close the "Software Sources" dialog.
Since we've just added a new repository we need to update that database that knows what packages are available and where from. Update the package information by:
Edit -> Reload Package Information
Find the "deadbeef" package in Synaptic, mark it and press "Apply"
libasound2-dev
libpulse-dev
libmad0-dev
libwavpack-dev
libsndfile1-dev
libcdio-dev
libcddb2-dev
automake
libtool
libsamplerate0-dev
libgtk2.0-dev
libavformat-dev
libcurl4-gnutls-dev
libdbus-1-dev
libfaad-dev
intltool
libimlib2-dev
libzip-dev
apt-get install libasound2-dev libpulse-dev libmad0-dev libwavpack-dev libsndfile1-dev libcdio-dev libcddb2-dev \
automake libtool libsamplerate0-dev libgtk2.0-dev libavformat-dev libcurl4-gnutls-dev libdbus-1-dev libfaad-dev \
intltool libimlib2-dev libzip-dev
NOTE: freepats package is required for MIDI plugin