Get Dokku working with Ubuntu 16.04 LTS

Dokku.sh

sudo sh -c "
  wget -nv -O - https://packagecloud.io/gpg.key | apt-key add -
  echo 'deb https://packagecloud.io/dokku/dokku/ubuntu/ trusty main' | tee /etc/apt/sources.list.d/dokku.list
  apt-get update -qq > /dev/null
  apt-get install sigil -t trusty # We're using the Ubuntu 14.04 package ;)
  apt-mark hold sigil
  
  wget https://raw.githubusercontent.com/dokku/dokku/master/bootstrap.sh
  bash bootstrap.sh
"