$ curl -fSsL https://deb.opera.com/archive.key | gpg --dearmor | sudo tee /usr/share/keyrings/opera.gpg > /dev/null
$ 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
$ sudo apt update
$ sudo apt install opera-stable
