Solved!
It was due to the Lightning extension. I had the version 0.7 of
Lightning installed and the Ubuntu installation updated Thunderbird but
not the Lightning extension. Funnily Thunderbird did not complain about
the incompatible Lightning extension. Anyway after uninstalling
Lightning and installing the current 0.8 version the problem was
resolved.
** Changed in: thunderbird (Ubuntu)
Status: New => Invalid
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lost screen real estate with ubuntu 8.04 upgrade
https://bugs.launchpad.net/bugs/222246
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