Ubuntu

Package Management

• clean cache: apt clean
• list installed packages: apt list --installed
• list manually installed packages: apt-mark showmanual
• remove package with dependencies: apt-get <remove/purge> --auto-remove <package_name>
• list installed packages from a specific source: aptitude search "?origin (<package_source>) ?installed"

Update the System

# fetch list of available updates
apt update

# list packages that can be upgraded
apt list --upgradable

# install some updates - do not remove packages
apt upgrade
# or
# install updates - also remove packages if needed
apt full-upgrade

# remove any old packages no longer needed
apt autoremove

.deb Files

• get info about a .deb file: dpkg -I <package_name>.deb
• list Content of a .deb File: dpkg -c <package_name>.deb

Configuration

• Proxy settings for all users in /etc/environment - also see https://www.serverlab.ca/tutorials/linux/administration-linux/how-to-configure-proxy-on-ubuntu-18-04/

Commands

• vheck ubuntu version: lsb_release -a

Install Ubuntu as a VirtualBox Guest

This describes how to install Ubuntu as a VirtualBox guest system to do experiments with docker or other stuff.

Basic installation

• download a server version of Ubuntu
• the current LTS version might be a good idea
• do normal installation

Install XFCE

To be able to copy and paste to and from the guest system you need a desktop environment like XFCE. XFCE is small compared to GNOME and the minimal installation does not contain LibreOffice and other stuff you do not need.

• install tasksel: sudo apt install tasksel
• execute tasksel: sudo tasksel
• select Xubuntu minimal installation
• press tabulatur and select Ok with return key
• reboot

Install VirtualBox Guest Additions

• apt install build-essential dkms
• link the VirtualBox Guest Additions iso image to a cd drive
• cd should be auto mounted to somewhere at /media if XFCE or GNOME is installed
• change to that directory and execute installation: sudo ./VBoxLinuxAdditions.run
• also see here: https://askubuntu.com/questions/1035030/virtualbox-guest-additions-installation-problem/1047193#1047193

Install Docker

To install docker do not install the package called docker. Docker is a “System tray for KDE3/GNOME2 docklet applications”. The package you need is called docker.io

• install with: sudo apt install docker.io
• start with: sudo systemctl start docker
• stop with: sudo systemctl stop docker
• enable (always start at boot time) with: sudo systemctl enable docker