I had to clean out a series of Yahoo bloatware programs and I'll write a post soon about building out an Ubuntu installation for a college student.
One glitch I did encounter was that the update manager refused to complete because it encountered an error (System -> Administration -> Update Manager).
After a very responsive call to Dell I was told to open a terminal window and enter:
sudo dpkg --configure -a
Once the system was reconfigured by this command, Update Manager worked just fine.