If you get the following error when your upgrading:
An unresolvable problem occurred while calculating the upgrade:
Trying to install blacklisted version 'blcr-dkms_0.8.2-13'
To fix, simply search for the package 'blcr-dkms_0.8.2-13' in package manager and mark for upgrade. Click apply and then try the system upgrade once again.
Ubuntu 10.04