dual system on one comuputer. necessary to re-install parental control program to ubuntu also to work?

yes you are using a different operating system unless you go back to the re-install and try to import settings (which im unsure you may) for this situation you would need to use something like firestarter (firewall) or perhaps Pyneighbor(may or may not)
or whatever you choose. the other issue is to secure the sites in any program you will need the root password and since your son has installed the ubu distro he would then be able to unblock or change the information you have used.

hope that gives you some direction

http://www.freesoftwaremagazine.com/articles/web_blocking_squid

this is written for "rpm" which is a suse package you may look around and find what you need

subliminalfix makes a good point about your son having the administrative rights if he was the one who installed Ubuntu. But even if you become the system administrator and change his account to that of an ordinary user, if he's able to install Ubuntu, then he's probably able to circumvent any parental control software you choose to install (on Ubuntu or Windows), IF that's what he really wants to do.

For a start, the standard installation CD can be used as a live operating system that doesn't have parental controls on it, and it's trivial to burn a new one if you take it away. Beyond that, most parental control software works by restricting allowed addresses, but proxies—and even Google—can be used to fetch data from somewhere while obscuring the web address and making it look 'safe'.

The reality of parental controls is that they're only useful in stopping children from _accidentally_ encountering content you'd prefer they didn't. But when it comes to stopping a determined child, it's more of a false sense of security for you and a minor hindrance to them.

For the former situation, I've read plenty of recommendations for DansGuardian http://dansguardian.org/ which is used by Ubuntu Christian Edition, and OpenDNS http://www.opendns.com/

Hi :)

Yes, i would go up to the menu's in FireFox and click on
Tools - AddOns - "Get AddOns"
and search for something useful in there. The search tolls should help a lot with that. While you are there it is well worth installing "AddBlock Plus" to make surfing faster and to stop nasty unwanted pop-ups from appearing fairly randomly.

If your son is smart enough to have installed Ubuntu in the first place then there is not really much you can really do to stop him looking in places if he really wants to. Trust is the key here. Trust and some gentle protection from accidental stuff from happening.

Consider that he has been smart enough to move away from the greed and commercialism rampant in the Windows world. Consider that his three main options were
1. making a fuss until you were forced to buy something fairly expensive
2. use pirated versions of expensive stuff (probably the easiest option)
3. choose something Free that encourages its users to learn and explore but might sometimes require a little extra work, intelligence or/and communication skills.

There are plenty of other reasons for choosing Ubuntu and we probably all had different reasons but it seems to me that you have plenty to be proud of right there.

There are Christian & Moslem Editions but often these are available as just extended themes or packages from both can be installed. Edubuntu might also be worth having a look at. Again i think a lot of those packages can be added to a 'standard' Ubuntu install. There are a LOT of educational or training packages, particularly in astronomy and curiously ham-radio(!) but the bulk of these were developed by university students or professors so some things may appear dull or be a bit too advanced. Fun to play around with tho!

The capital F in free was deliberate as this is more about "Freedom of Speech" than "free lunch" although both can be a good combination!

Good luck and regards from
Tom :)