As much as I love Mint, I really miss having a utility that lets me know that outgoing and incoming network traffic is occurring on my computer. On older LINUX distributions and on Windows the little icon of the two monitors in the control panel (that was for the network connection) would blink whenever data was flowing. It would be nice to have at least that functionality. A nice bonus would be: if you click on the network icon in the control panel, it tells you how many packets are going to which IP address or which IP address is sending data and how much including the amount sent. I wish I knew more about network communications and protocols because I would write it if I could. Unfortunately all I ever write is scientific programs that have very little IO so I don't know how to do it.
I used to keep a close eye on those blinking lights and more than once it told me that I had a Trojan in Windows when the little monitors (in the icon) would start blinking like a Christmas tree. If I wasn't doing any thing on the Internet or there was no good reason for network traffic I new something bad was happening. I would kill the connection and then check my logs. I could watch the lights on my router but its not as convenient as having it right on your desktop. If such a program already exists please let me know.
If I had to choose one thing that I really miss that would be it. Its like being blind and the only thing about Mint that is annoying.