Ubuntu – Why is the download speed slow on Ubuntu 11.10?

You have confused between local network speed and internet speed.

There are different specification for networking instrument.

I am assuming that you have some kind of modem / router in your home. The ISP connects to it.

• The modem/router and your computer Ethernet port have capability of handling 100mbps. So when you connect to it. it shows as 100mbps connection. This is between your router and your computer ethernet port.

• Similarly your router wireless transmitter (inside the roter) is capable of 150mbps. The asus tablet receiver has capability of 54mbps. So it connects at speed of 54mbps.

1. Why two wireless device has different speed?

   Its depends on hardware. There are different standard for wireless. You can read in detail over here.

2. Why I am getting 8 MBps (there's a big difference between small b and big B) speed as download speed

   This is the real speed your ISP provides. From your computer to router its 100mbps. But after router is controlled by ISP.

   So its upto your plan. If download speed (as shown in download managers)is 8 MBps [means 8 mega bytes (not mega bits) per seconds] it can be said your internet plan's allotted network speed is 8*8 = 64 mbps. (this is mega bit, 8 bit = 1 byte)

If your network speed is 8 mbps, then in download managers it would show 8/8 = 1 MBPS

Please do:

echo "options ath9k nohwcrypt=1" | sudo tee /etc/modprobe.d/ath9k.conf
sudo modprobe -rfv ath9k
sudo modprobe -v ath9k

Then:

echo -e '#!/bin/bash\n/sbin/iwconfig wlan0 power off' | sudo tee -a /etc/pm/power.d/wireless

Then set your wireless settings in network manager to match the images. Then reboot.