If you install the lightning calendar extension version .8 in thunderbird on an ubuntu box, you get a really nasty mess of an email client. You can’t create a new calendar, dates don’t show up right. It just flat out doesn’t work. To flat out make it work, all you have to do is install libstdc++5 BEFORE you install lightning.
sudo apt-get install libstdc++5
tada, works like a charm.