I don't know when this problem start to happen, but whenever I use Ubuntu on my computer, my whole house network is down. But when I switch back to windows, the whole house network is back again. Is there a problem with Ubuntu or just that my computer is eating a lot of bandwidth? Please help. Thank you
There isn't anything special in Ubuntu that eats bandwidth, at least not to that should cause the "whole house network is down".
Let's assume "whole house network is down" actually means "all the other computers can't get on the internet". This can be caused by a lot of things, and debugging is necessary. First I would confirm that it is indeed your computer that eats all the bandwidth. You could do this with nload:
Open a terminal(Ctrl-Alt-T or by menu) and install nload:
You could cycle through you interfaces(wifi, ethernet, etc) with arrow keys.
If it indeed is your computer eating bandwidth, you should check if it's inbound or outbound. Inbound could mean that an update is downloading, but a lot of outbound traffic is usually bad if your not uploading anything.