[Lazarus] Tray icon not working on Ubunut

[Anthony Walter]

In the future one thing we can do, if the desktop environment is popular
enough (I'd argue that Ubuntu is the most popular Linux for desktop users
distribution) is:

* Make a note of the problem
* Provide links to resources where people could start if they want to work
on a fix

Regarding point #1, on this page I see nothing noting the problem, even
though it;s been in existence since Unity was made the default interface in
2011 (more than four years ago):

http://wiki.freepascal.org/TrayIcon#Help.2C_Bug_Reporting_and_Feature_Request

Regarding point #2, here is some information which we could maybe link to
in the wiki or some other place of prominence:

https://wiki.ubuntu.com/DesktopExperienceTeam/ApplicationIndicators
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