chrome
$ wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
$ sudo sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
$ sudo apt update
$ sudo apt install google-chrome-stable
naver
$ sudo sh -c 'echo "deb http://repo.whale.naver.com/linux/ stable/" >> /etc/apt/sources.list.d/naver-whale.list'
$ wget -q -O - http://repo.whale.naver.com/linux/stable/public.key | sudo apt-key add -
$ sudo apt-get update
$ sudo apt-get install naver-whale-stable
$ sudo apt-get upgrade
opera
$ wget -qO- https://deb.opera.com/archive.key | sudo apt-key add -
$ sudo add-apt-repository "deb [arch=i386,amd64] https://deb.opera.com/opera-stable/ stable non-free"
OR
$ sudo add-apt-repository "deb [arch=i386,amd64] https://deb.opera.com/opera-beta/ stable non-free"
OR
$ sudo add-apt-repository "deb [arch=i386,amd64] https://deb.opera.com/opera-developer/ stable non-free"
$ sudo apt install opera-stable
OR
$ sudo apt install opera-beta
OR
$ sudo apt install opera-developer
