This happened to both of my Lenovos (X60 and my T61). A clean install of
Belenos didn't help.
It turned out to be because the modern kernel sees the (useless because it
requires proprietary software) internal wireless card. The logfiles fill up
long before logrotate can help.
If you have the same problem, you need to edit
/etc/network/interfaces--essentially this:
http://askubuntu.com/questions/143988/how-do-i-bring-up-my-wireless-network-at-boot
only backwards if you're not up for physically removing the card.
I can write a better tutorial for this later if I know that it is a common
problem and worth my time.
HTH
