Yesterday I upgraded to Ubuntu 9.04, every thing went smoothly as always with Ubuntu. The day before I did a new installation of Windows XP and what a pain it was! I have to manually install literally every drivers – chipset, graphic, network, etc. And after every install you did have to restart. But when installing Ubuntu everything just works, but when doing the upgrade I did discover one thing. You should not install Lightning 0.9 by downloading the xpi-file and from Thunderbird install the add-ons, but instead use synaptic.
$ sudo apt-get install lightning-extension
And if you are still using Ubuntu 8.1 you should install libstdc++5
$ sudo apt-get install libstdc++5
For more details of the bug read:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/278853
