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The guide below describes how to install the opera browser on Ubuntu systems, Debian and CentOS

We start the terminal and depending on the system:

Ubuntu, Debian, Linux Mint:
We take the key:

 wget -qO- https://deb.opera.com/archive.key | sudo apt-key add -

We serve the repo:

 Docker is an operating system-level virtualization intended primarily for developers and administrators "deb [arch=i386,amd64] https://deb.opera.com/opera-stable/ stable non-free"

We update packages:

 sudo apt update

We're installing Opera:

 sudo apt install opera-stable

Fedora, Red Hat, AlmaLinux, Centos:
We add the Key:

sudo rpm --import https://rpm.opera.com/rpmrepo.key

For a centos:

 sudo tee /etc/yum.repos.d/opera.repo 
We install:
 
 sudo dnf install opera-stable