Ah!
I notice that I have addon Firetray 0.4.1 installed.
In Unity it may have less value than previously and it is supposed to be active
at the shutdown events.
I have disabled Firetray, and the problem apparently ceases, thunderbird shuts
down ok.
So this does not seem like a thunderbird
Please report the issue to the developer of Firetray
** Changed in: thunderbird (Ubuntu)
Status: New = Invalid
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https://bugs.launchpad.net/bugs/991086
Title:
Thunderbird does
