Install 6tunnel by entering the following commands in the terminal
Update package repositories and get latest package information.
sudo apt update -y
Install the packages and dependencies with -y flag.
sudo apt install -y 6tunnel
Now that you have your 6tunnel installed
Package Description: TCP proxy for non-IPv6 applications
OS: Ubuntu 16.04 LTS Xenial Xerus
Dependent Packages (you may have to install the packages below if it is not installed automatically or is not available on your computer) :
TCP proxy for non-IPv6 applications