Oh, the reason is in your log:
Feb 27 16:40:07 kg-Studio-1737 thunderbird[7543]: Error: cannot open
display: :0
That means U8/Libertine failed to launch Xmir (or wait for Xmir) prior
to running thunderbird.
** Changed in: libertine (Ubuntu)
Importance: Undecided => High
** Changed in: unity8 (Ubuntu)
Importance: Undecided => High
** Changed in: xorg-server (Ubuntu)
Status: Incomplete => Invalid
** Changed in: canonical-devices-system-image
Status: New => Confirmed
** Changed in: canonical-devices-system-image
Importance: Undecided => High
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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1668429
Title:
thunderbird fails to launch, zesty u8
To manage notifications about this bug go to:
https://bugs.launchpad.net/canonical-devices-system-image/+bug/1668429/+subscriptions
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