Just been having a world of annoyance with Thunderbird seg faulting. I don’t know what caused it but I did install the Netbook Unity Desktop environment (which incidentally doesn’t work on my box).
So after the above I got:
myuser@mybox:~$ sudo thunderbird
Ended up going into user & groups properties and gave my user account more permissions.
I didn’t narrow it down to the exact lack of permissions and I couldn’t figure out via strace what was being denied. But this got my Thunderbird install going.