Hi! Here is solution for Opera 43. (Kubuntu 16.04 x64)
- We need to update Chromium browser to 56.0.2924.76 version (Opera 43 use this version of Chrome engine)
- Add repository - sudo add-apt-repository ppa:canonical-chromium-builds/stage
- Update system - sudo apt update
- Chromium must updated to 56 version
- As recently as advised tyrion-ua:
Now Opera plays videos from Twitter, Instagram, etc.