Here is what a freshly Ubuntu 16.04 Xenial AWS Machine Image (specifically ami-0181f8d9b6f098ec4) contains.
First and most importantly, only SSH daemon and DHCP client is running:
ubuntu@ip-172-1-2-3$ netstat -tupln
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1240/sshd
tcp6 0 0 :::22 :::* LISTEN 1240/sshd
udp 0 0 0.0.0.0:68 0.0.0.0:* 883/dhclient