[Ubuntu] add-apt-repository not found

$ sudo apt-get install python-software-properties

The following extra packages will be installed: python-pycurl python3-pycurl python3-software-properties unattended-upgrades Suggested packages: libcurl4-gnutls-dev python-pycurl-dbg python3-pycurl-dbg bsd-mailx mail-transport-agent The following NEW packages will be installed: python-pycurl python-software-properties python3-pycurl python3-software-properties software-properties-common unattended-upgrades

$ sudo apt-get install software-properties-common