I have a simple home peer-to-peer network with (currently) around 6 Lubuntu based computers connected (the number varies from week to week).
I just did a test where I accessed an MP4 video located on a Lubuntu 11.04 laptop from a Lubuntu 12.04 laptop, and it plays OK.
All of my Lubuntu computers (except the one running 12.10 that I'm just setting up at the moment) have been configured using the method used in Post#1 of this thread. So I would probably urge you to repeat the process on your Lubuntu 12.04 laptop.
As for fault finding, I suggest that you check you have the permissions you think you have by trying to access and open a range of files. Also check that the media files will play locally on your laptop (i.e. when transferred across to a directory on your laptop).
One other general point I'd like to make (not specifically to you Wolfpup) concerns the term "server". On a peer-to-peer network, where all networked computers have a few shared directories with read access, all computers are both clients & servers. In other words, any computer can access some files from any other computer.
You may chose to install the server version of 'buntu on a specific machine, and load it up with music and videos. But if the network is peer-to-peer, your server probably does not have any other unique duties. Its just a big computer that you leave on all the time. It does not validate users on the "network", it is not a Domain Controller.
So make sure you follow the full procedure in Post#1 because I don't know what problems you may encounter if you don't follow all steps on all your machines.
The process in Post#1 is also covered here: http://captainbodgit.blogspot.co.uk/...-win7-and.html which also includes some notes for Windows 7 and the Raspberry Pi.
Good luck. What you are trying to do will work, there's just the small detail of finding out why its not!
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