Ubuntu – Ubuntu Open Ports

I have recently installed two Ubuntu Server machines and I would like to find the open ports in the machine.

When I run nmap from my machine (Ubuntu 11.10) I observed that both servers have

135/tcp  filtered msrpc
4444/tcp filtered krb524
4662/tcp filtered edonkey
5000/tcp filtered upnp
5631/tcp filtered pcanywheredata

I have never opened those ports. I only installed LAMP and SAMBA. Why are these ports open?

The complete list of the open ports are:

22/tcp  open  ssh
25/tcp  open  smtp
53/tcp  open  domain
80/tcp  open  http
110/tcp open  pop3
135/tcp  filtered msrpc
139/tcp  open     netbios-ssn
143/tcp  open     imap
445/tcp  open     microsoft-ds
993/tcp  open     imaps
995/tcp  open     pop3s
4444/tcp filtered krb524
4662/tcp filtered edonkey
5000/tcp filtered upnp
5631/tcp filtered pcanywheredata

The question is why are these ports open: 135/tcp filtered msrpc, 4444/tcp filtered krb524, 4662/tcp filtered edonkey. 5000/tcp filtered upnp, 5631/tcp filtered pcanywheredata. I have never opened those ports. I only installed LAMP and SAMBA.

Does that list seem secure?