Update packages for Ubuntu 18.04

Default package list is a bit short, so if you want to use standard packages you'll need to amend it:

• Confirm it's release (you'll need this in the next step)
  cat /etc/*-release
• For 18.04 Package isn't included in the default sources.
• Search for it e.g. https://packages.ubuntu.com/search?keywords=xen-hypervisor&searchon=names
• Modify the package sources list to include it's source:
• sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
• vi /etc/apt/sources.list
• Add:
  deb http://archive.ubuntu.com/ubuntu/ bionic main restricted universe multiverse
  deb http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted universe multiverse
  deb http://archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
  deb http://security.ubuntu.com/ubuntu bionic-security main restricted universe multiverse
  deb http://archive.canonical.com/ubuntu bionic partner
• sudo apt-get update