There is no ppa for opera, for a couple of reasons. First, opera has its own repo, which is this, and it has been around since I remember using opera
deb http://deb.opera.com/opera/ stable non-free
Second, opera is closed source and launchpad (home of all those ppas) only hosts open source projects.
Finally, when you install opera from its deb file, apt also installs its repo and the key for it, so there is no need for the user to do anything more in order to update opera.
@michaelbr Thanks. I was hoping Opera wasn't going to be as finicky as the others and not pimp out my Internet usage. I've taken to shopping the paid browsers - but the cost of maintaining my right to privacy is getting too expensive. Easier, and almost worth it to shoot the router.
Good luck with FF.
Okay, after much experimentation, it seems like I have a strong suspect now among my extensions. Now I've only disabled this Flash Video Downloader: https://chrome.google.com/webstore/detail/flash-video-downloader/aiimdkdngfcipjohbjenkahhlhccpdbc?hl=en-US
And since that, notifications started to get through. I don't know how I've missed it earlier, but this seems to be the culprit. I just leave this here as future reference, I guess I'm not the only one using this extension in Opera...
I was having password problems today, one particular password, current Opera version, and the Synchronisation tool fixed it. It's under Settings > Basic. It's useful for keeping stuff matched between different machines, and one reason I keep using Opera despite the problems there can be with video codecs.
I know this is an old thread, but it keeps popping up on search engines. This answer works in August 2018, v55.0 under Linux.
I have the problem solved. Made a clean install of Ubuntu 18.04 and installed the latest Opera. Everything worked fine untill I installed 'Zoomba', an extension I used before because it lets you adjust the zoomlevel of the scroll-wheel. So it's more then likely that 'Zoomba' is not compatible with the latest Opera versions anymore .