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I managed to get rid of that doing
curl -fsSL https://deb.opera.com/archive.key | gpg --dearmor | sudo tee /usr/share/keyrings/opera.gpg > /dev/null
and
echo deb [arch=amd64 signed-by=/usr/share/keyrings/opera.gpg] https://deb.opera.com/opera-stable/ stable non-free | sudo tee /etc/apt/sources.list.d/opera.list
In general I followed this blog post.
Hope this helps.
Whenever I try to update my ubuntu 22
sudo apt update
I receive an error
Il repository "https://deb.opera.com/opera-stable stable InRelease" non è firmato.
That in English should be rawly
Repository "https://deb.opera.com/opera-stable stable InRelease" not signed.
As you can see in the attached screenshot I also receive a message stating that the public key is not available.
I heard that for Opera version 100 they changed the key to celebrate this goal.
Can anyone help me? I am not able to "apt update" my Ubuntu 22 due to this problem.