# Add new apt source:
### Location
/etc/apt/sources.list.d/

#### Example content:
deb http://ddebs.ubuntu.com ${VERSION_CODENAME} main restricted universe multiverse
deb http://ddebs.ubuntu.com ${VERSION_CODENAME}-updates main restricted universe multiverse
deb http://ddebs.ubuntu.com ${VERSION_CODENAME}-proposed main restricted universe multiverse


### Add the public key
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys