Sorted - Opera changed the name of the file in /etc/apt/sources.list.d so there were two there. This causes a different problem and I foolishly deleted the wrong one to fix that.

The one with 'archive' in the name is the old one, right? Wrong...

@dlsumy Ah, thanks - somehow I managed to delete the wrong file for Opera in /etc/apt/sources.list.d/ (having two was causing a different error) and removed the new one rather than the old one.

Why Opera decided to change the name of the file is a different question

@marinaz909 said in Opera 119.0.5497.56 Stable update:

Thank you for your report! The key has been updated. However, for some Linux machines, there may be a need to manually install the new certificate. Please refer to the following manuals for guidance:
https://rpm.opera.com/manual.html
https://deb.opera.com/manual.html

I did the download of the new key and I'm still getting a 'private key not found' problem, even after downloading and installing the .deb over the same version.

See https://forums.opera.com/topic/85007/duplicated-opera-s-signing-key-not-found

@leocg

Thanks, but that just points to the page I've linked to (and copied the commands from) above.

I've done that. I'm still getting the 'public key not available' error.

It's not impossible that the issue is that Qwant aren't paying them to include it in the list.

I'd like to have Qwant too. Opera isn't going to be my default browser without letting me set the default search to the site I want to use.

OK, it's been tagged as 'duplicated', and I know this sort of thing happens every time Opera change their signing key, but where's the solution?

I've looked back as far as 2023 in this bit without spotting anyone else having a problem with this recently, never mind been given the solution for the missing 2025 signing key.

I am using Linux Mint 22.1, based on Ubuntu 24.04. I have recently started to get an error from

sudo apt-get update

"W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://deb.opera.com/opera-stable stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 11EE8C00B693A745"

I see that there's a new signing key for 2025.

I have done (again) the

wget -qO- https://deb.opera.com/archive.key | gpg --dearmor | sudo dd of=/usr/share/keyrings/opera-browser.gpg

echo "deb [signed-by=/usr/share/keyrings/opera-browser.gpg] https://deb.opera.com/opera-stable/ stable non-free" | sudo dd of=/etc/apt/sources.list.d/opera-archive.list

per the instructions at https://deb.opera.com/manual.html

Same error.

I have downloaded and installed opera-stable_119.0.5497.56_amd64.deb

Same error.

The various files look OK:

$ cat /etc/apt/sources.list.d/opera-stable.list 
deb [signed-by=/usr/share/keyrings/opera-stable-archive-keyring.gpg] https://deb.opera.com/opera-stable/ stable non-free

$ ls -lha /usr/share/keyrings/opera-browser.gpg 
-rw-r--r-- 1 root root 1.8K Jun  2 14:04 /usr/share/keyrings/opera-browser.gpg

.. but at the moment, I have Opera installed and working, but the system has stopped being able to check for updates.