Opera does not upgrade or install in Exe Gnu/Linux (and devuan also), because it has different libgbm version. The fix is to make a custom installation package and install that package. Unfortunately Opera needs to upgrade by hand by making a package (or Opera fixes their package).
1. Download Opera from https://www.opera.com/fi
2. Extract the package and edit
DEBIAN/control file like
3. Set permissisions for root
sudo chown root:root -R opera-stable_68.0.3618.165_amd64-fixed
4. Make a fixed package
sudo dpkg -b opera-stable_68.0.3618.165_amd64-fixed opera-stable_68.0.3618.165_amd64-fixed.deb
Edit 20.7.2020: With mint 18 and Ubuntu 16.04 Opera does not upgrade, so I made a fixed package for them.