update

docs/install_ubnutu.sh

@@ -5,6 +5,7 @@
 sudo -E apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
 echo "deb http://download.mono-project.com/repo/ubuntu xenial main" | sudo -E tee /etc/apt/sources.list.d/mono-official.list
 echo y | sudo -E apt-get update -y
+echo y | sudo -E apt-get upgrade -y
 curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
 echo y | sudo -E apt-get install -y curl git build-essential libreadline-dev libsqlite3-dev mono-complete nodejs
 sudo -E npm install pm2 -g