I have windows and ubuntu installed on two partitions. I was having ubuntu 11.10 till now, where in I never had any issue with the wired network connectivity. When I click on the network icon on the "taskbar" sort of thing, I can see sections for both "wired network" and "wireless network", and the wired network shows the network details when I simply plug in the lan cable. This works perfectly - just plug in and you are ready to go with wired internet.
I had to remove v11.10 and install v10.04 lts of ubuntu recently. Here, after installation I noticed that when you click the same network icon in the "taskbar" sort of thing, the section for "wired network" itself is missing. Instead, all i am presented are the wireless networks that are available in the vicinity. I tried adding a wired network using the network manager applet, but still it does NOT list the wired network details. Plugging in the lan cable has absolutely no effect on the system. No response.
I reverted to v11.10, and my wired network just simply works like magic.
Please tell me what is going wrong with ubuntu v10.04 lts in my system. Since I am pretty new to linux, please elaborate if possible any technical steps i need to take.