ls -l /var/lib/dpkg/info | grep -i libssl
When you see both 1.1.0 and 1.1.1, you need to do the following :
sudo mv /var/lib/dpkg/info/libssl* /tmp
sudo apt-get update
sudo apt-get -y dist-upgrade
sudo apt-get -y autoclean
sudo apt-get -y autoremove
The problem should be solved.
That's all! See you.
UPDATE
Since Ubuntu has fixed the problem recently, you need to do the following to fix the missing libssl1.1.0.
sudo apt-get --reinstall -y libssl1.1.0