deb http://br.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse

deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse

deb http://br.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted universe multiverse

#                  +---------------+-------------------+
#                  | Free software | Non-free software |
#------------------+---------------+-------------------+
#   By Canonical   |     Main      |    Restricted     |
#------------------+---------------+-------------------+
# Not By Canonical |   Universe    |    Multiverse     |
#------------------+---------------+-------------------+