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I have the problem that system trays in Ubuntu 18.04.1 (using GNOME) are not visible. I found a similar topic (Missing system tray icons Ubuntu Gnome 18.04) but the command sudo cpan -i Gtk2::AppIndicator did not solve the problem. Maybe this can be of interest. During the removal operation of unity, I got the following error, which is related to the appIndicator:

Configuring O/OE/OESTERHOL/Gtk2-AppIndicator-0.15.tar.gz with Makefile.PL
pkg-config --cflags appindicator-0.1 gtk+-2.0 didn't succeed, make sure it is righly installed at Makefile.PL line 17.
Warning: No success on command[/usr/bin/perl Makefile.PL INSTALLDIRS=site]
  OESTERHOL/Gtk2-AppIndicator-0.15.tar.gz
  /usr/bin/perl Makefile.PL INSTALLDIRS=site -- NOT OK

No system tray is visible and if I open skype or pidgin and close the application window, I cannot re-open the application in an easy way. Any link, support is appreciated. Thank you, Tobi

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According to the search on https://packages.ubuntu.com you need to install the following packages - libappindicator-dev and libgtk2.0-dev:

sudo apt install libappindicator-dev libgtk2.0-dev

and then retry with sudo cpan -i Gtk2::AppIndicator.

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  • Hi @NOrbert, thank you for the hints. However, it does not work. Well, the removal is working now but I still do not have any system trays. – Tobi Jan 13 '19 at 17:11
  • By installing this packages I have solved the warning message problem. You can use search on this site to get trayicons on modern GNOME (usually with the help of extensions). – N0rbert Jan 13 '19 at 17:32

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