[ALUG] Font config ?

When everyone's exhausted the mice jokes (pesky meeces) can you apply your minds to this. I have googled and see it's a common problem but didn't understand the solution. While I was upgrading to 14.04, a message came up to say 'font config out of memory lines 14, 23 and 32.' It now says this when I switch the computer off. So, what does it mean and how do I fix it? Bev.