So I used the older deb ubuntuzilla method to get seamonkey 2.0. I then successfully updated this, though I did have a sudo-caused permissions/ownership problem which I fixed. Seamonkey 2.02 is now available but there is also a new ubuntuzilla method to get it.
In a series of removals to tidy things up to get it (removing seamonkey 1.1.x which was still there for some reason, of the old unubtuzilla, of the ubuntuzilla installed seamonkey 2.0...) something broke.
I now cannot finish an install of seamonkey 2.0.2. It claims to install but there is no link put in /usr/bin/ for the binary file (it is in /opt/seamonkey though and can be run from there) and attempting to remove the package ends up failng because of the lack of /usr/bn/seamonkey
I've fixed it by doing a
sudo ln -s /opt/seamonkey/seamonkey /usr/bin/seamonkey
but I'm concerned that I may have not really fixed the underlying problem so is there something else I should do too? there was, I saw, some error about /usr/bin/seamonkey.ubuntu which doesn't exist either