Ubuntu 18.10: Install Opera for Web Browser

#!/bin/sh -e

# Install opera.
URL=http://download3.operacdn.com/pub/opera/desktop/56.0.3051.52/linux/
wget -q ${URL}/opera-stable_56.0.3051.52_amd64.deb
echo "opera-stable opera-stable/add-deb-source boolean true" | \
  sudo debconf-set-selections
sudo dpkg -i opera-stable_*.deb || \
  (sudo apt -f install -y && sudo dpkg -i opera-stable_*.deb)
rm -f opera-stable_*.deb

# Install flash.
sudo apt install -y pepperflashplugin-nonfree
sudo update-pepperflashplugin-nonfree --install