After successfully updating my Ubuntu 10.04.02 64-bit VM with the usual:
sudo apt-get update && sudo apt-get upgrade
The message of the day (MOTD) did not reset the number the number of packages that required updating. Mine was stuck on:
30 packages can be updated. 23 updates are security updates.
To remedy this, clear out
/etc/motd.tail with this command:
cat /dev/null > /etc/motd.tail
When you login again, all will be right with your MOTD.