In this HowTo present the solution to the problem of a lack of internal microphone, available in some laptops / netbooks.

Skype for Linux distributions uses the PulseAudio sound server. Often, the internal microphone does not record sound audio.

HowTo applies to virtually any Linux distribution, however, due to some significant differences between the various distributions, I will present a walkthrough of the family of systems Debian (Debian / Ubuntu / Mint).

Install the latest version of Skype for our distribution.

Launch Skype.
Go to the audio settings of the program.
Uncheck the audio settings of Skype "Allow Skype to automatically adjust the volume level." Close the program.

In the terminal execute the command:

alsamixer

press F5 and go right on Capture. Hit the spacebar.
Then press the up volume set sound recording (optimally at about 70%)
Just press the keyboard letter Z and completely silenced the left channel.
We close alsamixer pressing Esc.

Fire up Skype and make a test call.