For anyone still running in to this, the main reason I wanted the title bar was to be able to see the Ubuntu / Linux system context menu, to set "Always on Top". There doesn't appear to be a way to make the system title bar show up, but you can get that context menu by hitting Alt+Spacebar.
Just to add that I recently is meeting the same issue. By recently I actually mean 1 or up to 2 months. This is fairly weird because I did reinstall opera a little before and I had no issue. As far as I can remember, It appeared while I was properly logged. Was it after a backup ? Is it linked to a degraded service ? I can't tell for sure.
What I can tell for sure is as soon as I log with my opera credentials it freezes the browser for quite some time. I just retried though and it froze and successfully logged and synced. Let's see what experience will it come with in usage.
Same problem here.
As you: "I found all of my stored passwords are corrupt. They all start with "v11" and appear to have Unicode characters in them (I see a black diamond with a question mark in the middle)."
I have Linux Mint too.
I don't know when It happened cause I used to autologin, generally, and the first time I had to re-login I found any passwords were corrupted and lost.
Well it's an understatement if I say it's a rather unpleasant thing...
I suppose a few files should be untouchable IMHO
By the way I have Opera browser sync on W10 and now I have error trying to sync browsers.
But yes I recovered passwords from Opera Browser on W10.
Have a nice day
The solution given works for me. The only thing I've noticed is that the highlight on the main menu accessible from the Opera button is missing when using the dark theme; with the light theme everything seems normal for me. Every site I've visited works, including YouTube. Considering that Ubuntu 16.04 Xenial, a long term support version of the OS, is supported until April 2021 it's a real pity that Opera 69 and above can only now be installed by rebuilding a deb package. Surely Opera should always run on all LTS versions of Ubuntu while they continue to be supported? Otherwise people who have been loyally using Opera for years, in this case over four years, will suddenly find that their system no longer updates via the Opera repository and that the lastest deb packages can't be installed on their system without any warning.