Add Skype icon in message applications in Ubuntu 14.4

After installing Skype in your system , you may need to have it in tray icons or in message applications.

So for adding it in message applications first of all try to find ".desktop" file.

# updatedb
# locate skype.desktop

It will show you something like this:

/usr/share/applications/skype.desktop

Ok , now we get list of all message applications:

$ gsettings get com.canonical.indicator.messages applications

In my system , it returned me : "['pidgin.desktop']" . because I installed pidgin.
It maybe returns you different values because you may installed other message applications.

Ok , you we need to add "skype.desktop" in that list:

$ gsettings set com.canonical.indicator.messages applications "['pidgin.desktop','skype.desktop']"

Note: be careful you should add all of values + "skype.desktop" like I did above. I had "pidgin.desktop" + new application "skype.dekstop"

Be success.