Ubuntu WLAN problem

Hi all,
after having lost a lot of braincells, I'll give it a try and will ask in this forum for help.
Some months ago I've bought some Netbook Samsung N510.
It was installed with Windows 7. Last weekend I've decided to change the OS to Ubuntu 11.04. Everything is working fine, but I don't get the WLAN to work

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blah@pc:~$ lspci | grep -i net
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8192E Wireless LAN Controller (rev 01)
04:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller (rev 13)

In Wicd Network Manager I don't see some wlan network.

Atm I'm thinking about buying some new WLAN-card via USB cuz I don't get it. I've downloaded a lot of drivers and installed many things to get it to work, but without success. It will be great, if anyone can help me out with this problem.

PS: please step-by-step cuz I'm new to this stuff and don't have much experience in Ubuntu

Thanks,
Jinx

try to use iwconfig
something like iwconfig wlan0 up
and also maybe driver not loaded try to find and load needed driver(if ofcourde it excist).

i'm new to linux aswell and apart from what freeartman said...
is the wireless card turned on? its so simple but i also missed it

theres usually a shortcut like Fn + f2 (f2 on mine but look for wireless symbol)
with that try turning it on or... off then on again.

and when you right click on wireless manger, enable wireless has a tick?

adding to what freeartman said, run 'iwconfig' by itself to see a list of devices to get its name...

hope this helps

For me it's Fn+F9 but it doesn't show something like "Turned On". I think it's enabled. With "iwconfig" it says:

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lo no wireless extensions.

eth0 no wireless extensions.

wlan0 802.11bgn ESSID:""network""
Mode:Managed Access Point: Not-Associated Bit Rate:1 Mb/s
Retryn RTS thrff Fragment thrff
Encryption key:bluubbbbb Security modepen
Power Managementff
Link Quality=0/100 Signal level=0 dBm Noise level=0 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

seems ubuntu 11 is still buggy, i'm on 10.
from what i've read around,try this:
http://apt.ubuntu.com/p/linux-backports-modules-wireless-maverick-generic

i've bought some new wlan-stick (TL-WN821N). This one seems to work. I hope to get it to run.

Well, finally it's working fine. Thanks for all comments. A special thanks goes out to paipai for killing his brain as well