Comment 6 for bug 1545501

I should add that in addition to running Joseph Salisbury's (very kindly) suggested apt-get commands, I also inserted a command as a result of running the first. When I ran 'apt-get install -f' , the output suggested running 'apt-get -autoremove', so I did. In summary, you might try this:

sudo apt-get install -f
sudo apt-get autoremove
sudo apt-get clean
sudo apt-get update

Then try installing updates.

At any rate read the output of 'sudo apt-get install -f' and see what it suggests in your circumstances.

hth