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I installed Spotify using the official repository but the icon does not appear in Wingpanel. Someone with the same issue?
Spotify client is a QT-based application which relies on sni-qt to display it's indicator icon. Maybe somehow sni-qt got removed by uninstalling another application on your machine.
Check if sni-qt is installed:
dpkg -l | grep sni-qt
In case it's not, reinstall it:
sudo apt-get install sni-qt
Required, but never shown