Thanks for all of the great suggestions guys, wish me luck! I know this
is asking a lot, but is there a way of saving my Ubuntu / Thunderbird /
Firefox settings, history, extensions, mail etc, so that when I reformat
everything it's all still there? Or os that the point of the whole
re-formatting thing, that everything gets erased and you start again
afresh? It would be a real pain to lose all of my bookmarks and
received / sent emails.