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Installing ROS Melodic & ROS Dashing inside a Ubuntu Bionic chroot

Install Ubuntu inside a chroot. Follow guide from here
Fix /etc/resolv.conf

nameserver 8.8.8.8

Fix /etc/hosts. On the second line put the name of your hostname instead of 'shirka'.

127.0.0.1	localhost
127.0.1.1	shirka

Add all ubuntu repositories. Edit file /etc/apt/sources.list:

deb http://mirrors.ucr.ac.cr/ubuntu bionic main universe restricted multiverse
deb http://mirrors.ucr.ac.cr/ubuntu bionic-updates main universe restricted multiverse
deb http://mirrors.ucr.ac.cr/ubuntu bionic-backports main restricted multiverse

Update repos

$ apt-get update

Install the following packages:

$ apt-get install sudo mc nano curl lsb-release gnupg2 apt-utils bash-completion locales

Add a new user in the chroot

$ adduser user

Add your new user to sudo group

$ adduser user sudo

Fix sudo error with visudo:

$ visudo

%sudo   ALL=(ALL:ALL) NOPASSWD:ALL

From now on, use your new user for the following steps:

$ su user

Follow guide for ROS Melodic from ROS: http://wiki.ros.org/melodic/Installation/Ubuntu
Follow guide for ROS Dashing from ROS: https://index.ros.org/doc/ros2/Installation/Dashing/Linux-Install-Debians/

Creating ROS Dashing Workspace

From ROS Crystal (ROS 2) to newer versions, ROS use Colcon for building all packages. This guide shows the basic steps for creating a Colcon Workspace.

Install colcon

$ sudo apt install python3-colcon-common-extensions

Create workspace for ROS 2

$ mkdir -p ~/ros2_ws/src

Move to the new workspace and build it

$ cd ~/ros2_ws
$ colcon build

Source workspace configuration

$ source ~/ros2_ws/install/local_setup.bash && source ~/ros2_ws/install/setup.bash