Restart your computer and follow above.

to update your package list.

sudo apt-get update

to clean up any partial packages.

sudo apt-get autoclean

to clean up the apt cache.

sudo apt-get clean

clean up any unneeded dependencies.

sudo apt-get autoremove

Resolve dependencies of broken packages

sudo apt-get install -f

fix dependencies

sudo apt-get install --fix-missing

Correct dpkg

sudo dpkg --configure -a

Run all this list more than once to fix the problem, if it was not resolved.