I have this mini router and on today I get slow internet speed with it on my desktop which has ubuntu. I have connected my laptop with the router and I got faster internet on the laptop. So I turned on the tethering on my phone and connected my desktop and now my internet connection is fast. However, when I connected with my router the internet is extremely slow on my desktop. I don't know what causes the problem.
I have this problem after I used a Mozilla extension named firex proxy.