Vivaldi is a free and modern highly customizable web browser for windows, Mac OS and Linux OS from Vivaldi Technologies, a company founded by former co-founder and CEO of Opera, Jon Stephenson von Tetzchner. It comes with built-in Mail client, Calendar and Feeds, Ad Blocker, Tracking Protection, Tab Tools, Translate, Chrome extensions support, web panel, custom themes, sync, screenshot capture, Tab Tiling, Notes, contacts and lots more.

Install Vivaldi on Ubuntu Linux
Vivaldi is available via the native .deb package file for Ubuntu Linux. You can download and install easily in your computer.
Download Vivaldi in .deb package file from the above download link and save it in your Downloads folder. Open the terminal app (ctrl+alt+t) and run below commands one by one to install it on your system.
sudo apt install ./Downloads/vivaldi-stable*.deb
That’s it now you can open Vivaldi from application menu. You can also use the exact file name like below command.
sudo apt install ./Downloads/vivaldi-stable_4.1.2369.21-1_amd64.deb
Here “vivaldi-stable_4.1.2369.21-1_amd64.deb” is the downloaded file name. You can change based on your file
[OR]
You can also use below method to install it.
cd Downloads
sudo dpkg -i vivaldi-stable_4.1.2369.21-1_amd64.deb
sudo apt install -f
[OR]
You can also install vivaldi manually. First import the public key using below command.
wget -qO- https://repo.vivaldi.com/archive/linux_signing_key.pub | sudo apt-key add -
Then add the vivaldi repository by
sudo add-apt-repository 'deb https://repo.vivaldi.com/archive/deb/ stable main'
and finally install Vivaldi browser using below command.
sudo apt update && sudo apt install vivaldi-stable
That’s it.