The Ubuntu installation instruction prescribes using add-apt-repository (from the software-properties-common package) which isn't installed as part of the base system.
$ sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe"
sudo: add-apt-repository: command not found
A workaround suggested elsewhere is to add the repository to /etc/apt/sources.list manually. This command should do the trick in most cases: echo "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe" | sudo tee -a /etc/apt/sources.list.
The Ubuntu installation instruction prescribes using
add-apt-repository
(from thesoftware-properties-common
package) which isn't installed as part of the base system.A workaround suggested elsewhere is to add the repository to /etc/apt/sources.list manually. This command should do the trick in most cases:
echo "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe" | sudo tee -a /etc/apt/sources.list
.