I have downloaded Opera for Linux 64-bit version, but when I try to install via Ubuntu Software Center it tells me it is the wrong architecture. What can I do?
I'd recommend installing Opera using the Opera repository. That way it will install the version that is needed and run the updates automatically.
To add the Opera repository, run the following in the terminal:
sudo add-apt-repository "deb https://deb.opera.com/opera/ stable non-free" wget -O - https://deb.opera.com/archive.key | sudo apt-key add - sudo apt-get update sudo apt-get install opera-stable
(if you prefer beta releases, use
deb https://deb.opera.com/opera-beta/ stable non-free in the first line above).
For more details see the guide on manual setup of the Opera apt repository.
To install Opera, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:
wget snapshot.opera.com/unix/dancingelephant_12.13-1725/opera_12.13.1725_i386.deb sudo dpkg -i opera*.deb
wget snapshot.opera.com/unix/dancingelephant_12.13-1725/opera_12.13.1725_amd64.deb sudo dpkg -i opera*.deb
There is a generic Opera repository available at http://deb.opera.com (with full description of how to add it). The Canonical repository for Opera no longer works
deb http://deb.opera.com/opera/ stable non-free
The line above will make sure you get all final public releases. By default the sources repository is also added (which does not exist for Opera) so remove that. Add the following line if you want to get the newer alpha and beta releases instead.
deb http://deb.opera.com/opera-beta/ stable non-free
It is advisable that you add the Opera GPG key.
wget -qO - http://deb.opera.com/archive.key | sudo apt-key add -
(If you get "The following packages cannot be authenticated" warnings, you'll also need this:)
sudo apt-get install debian-archive-keyring
Install via the shell
sudo apt-get update sudo apt-get install opera