Is a language pack bug. Disabling Italian Language pack from Language tab (from Add-ons menu in Thunderbird) I can stick the icon in the launcher and get the quick-list back.
The gsettings key is updated when I click "stick on launcher" giovanni@shrimp:~$ gsettings get com.canonical.Unity.Launcher favorites ['nautilus-home.desktop', 'google-chrome.desktop', '/home/giovanni/bin/unity/CustomSSH.desktop', 'gedit.desktop', 'virtualbox-ose.desktop', 'filezilla.desktop', 'libreoffice-writer.desktop', 'libreoffice-calc.desktop', 'ubuntu-software-center.desktop', '/home/giovanni/.local/share/applications/thunderbird.desktop'] giovanni@shrimp:~$ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/765736 Title: Thunderbird won't stay in launcher and no quicklist -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
