在RPI2（UbuntuMate）上安装openssh服务器

我正在尝试在RPI2上安装openssh服务器，并使用etc/rc.local安装新的Ubuntu Mate。所以我试着用这个：

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

apt-get update && apt-get -y install openssh-server

exit 0

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但在RPi上没有安装或更改任何内容。我做错了什么？

run'sudo service ssh status'run'sudo service ssh status'