Comment 3 for bug 1542453

Required log is in attachment.

Looks like similar problem: https://lists.ubuntu.com/archives/ubuntu-users/2014-November/278525.html

I removed /etc/init.d/virtuoso-nepomuk
then
sudo dpkg --configure -a
sudo apt-get purge virtuoso-nepomuk
sudo apt-get install -f
sudo apt-get upgrade

For now upgrade is in progress.