Command
gsettings get com.canonical.Unity.Panel systray-whitelist
This returns something like ['a', 'b', 'c']
then do
gsettings set com.canonical.Unity.Panel systray-whitelist "['a', 'b', 'c', 'istanbul']"
Command
gsettings get com.canonical. Unity.Panel systray-whitelist
This returns something like ['a', 'b', 'c']
then do
gsettings set com.canonical. Unity.Panel systray-whitelist "['a', 'b', 'c', 'istanbul']"