Download Monitor – Monitors the amount of data uploaded and downloaded over a network
Monitors the amount of data downloaded and uploaded over the network over time. Displays this data in easy to read graphs. Allows a usage quota to be set and warns when the quota is exceeded or soon to be exceeded. Useful for people on capped data plans.
Install download monitor in ubuntu 12.04
Open the terminal and run the following commands
sudo add-apt-repository ppa:duncanjdavis/download-monitor-submit
sudo apt-get update
sudo apt-get install download-monitor