when ever i click on the add and remove tab it says
"Failed to check for installed and available applications
This is a major failure of your software management system. Please check for broken packages with synaptic, check the file permissions and correctness of the file '/etc/apt/sources.list' and reload the software information with: 'sudo apt-get update' and 'sudo apt-get install -f'."
and nothing comes up...everythings grey. i don't know what to do...any help? i'm screaming right now becuz my systems is all wack and i don't know when i'll be able to install windows 7. i have linux ubuntu 8.10 right now(it came with my laptop). how can i fix this problem?