Upgrade Debian Linux to Unstable

See https://wiki.debian.org/DebianUnstable.

First, upgrade to testing, then do (as root):

su -

cat <<EOF >/etc/apt/sources.list
deb http://deb.debian.org/debian unstable main
deb http://deb.debian.org/debian-debug unstable-debug main
deb http://deb.debian.org/debian-ports unstable main
EOF
apt-get update
apt-get dist-upgrade -y
apt autoremove -y

Then answer the questions.

Consider limiting the architecture to amd64 (if that's what you use):

cat <<EOF >/etc/apt/sources.list
deb [arch=amd64] http://deb.debian.org/debian unstable main
deb [arch=amd64] http://deb.debian.org/debian-debug unstable-debug main
deb [arch=amd64] http://deb.debian.org/debian-ports unstable main
EOF
apt-get update
apt-get dist-upgrade -y
apt autoremove -y