How do I continue configuration if apt-get was interrupted?
Use the command:
sudo apt-get -f install
If that doesn't work, you can direct dpkg to finish setting up any packages that were only partially set up:
sudo dpkg --configure -a
If it doesn't work than you can reconfigure all the packages with:
sudo dpkg-reconfigure -a
In addition to the response by @Frantique, I would like to add:
sudo dpkg --configure -a
That solved my issue when the upgrade was interrupted during the process.