Why my roommates' connection to the Internet is lost, when I'm connected to our router on Ubuntu?

We have 4 computers in our flat. When I'm starting to use Ubuntu and when I'm connected to our network, at least one of them has connection problems, that is, their connection status says that everything is fine, but they can't, for example, explore the Internet or play online games. Nothing like that happens when I'm using Windows. How to fix it? My Ubuntu version is 13.10

Solution 1:

In Ubuntu 13.04, I believe the default bcmwl-kernel-source will not work correctly for your Broadcom 4313. I recommend that you get a temporary wired ethernet connection and open a terminal:

sudo apt-get remove --purge bcmwl-kernel-source
wget http://us.archive.ubuntu.com/ubuntu/pool/restricted/b/bcmwl/bcmwl-kernel-source_5.100.82.112+bdcom-0ubuntu3_amd64.deb

Or, if yours is a 32-bit system:

wget http://us.archive.ubuntu.com/ubuntu/pool/restricted/b/bcmwl/bcmwl-kernel-source_5.100.82.112+bdcom-0ubuntu3_i386.deb

Confirm 32- or 64-bit:

arch

Then do:

sudo dpkg -i bcmwl*.deb

Reboot and give us your report.

Solution 2:

Have you check to see if your Ubuntu box is running a DHCP server?

It may be trying to act as a router.

Try this:

sudo ps -ef | grep dhcp

and if it returns anything, you might want to kill that process.

Post the results and I can help further.