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Symbols: (U)p (B)ack (L)eft (R)ight (F)ront, U' means rotating in counter-clockwise direction, while U means clockwise.

Show Skype icon on top bar and launcher on Ubuntu

Problem: Skype icon not showing on panel tray (top bar) and launcher (left bar)

Affected: Ubuntu 12.04

Cause: installation from .deb

Solution:

sudo apt-get install sni-qt sni-qt:i386
gsettings get com.canonical.Unity.Panel systray-whitelist
gsettings set com.canonical.Unity.Panel systray-whitelist "['JavaEmbeddedFrame', 'Wine', 'Update-notifier', 'Skype']"

Source:

How do I Get the Skype Status Icon Back on Panel Tray