Run WiFi on lenovo X201 in Ubuntu 10.04

There can be problem on Ubuntu 10.04 with Intel Corporation WiMAX/WiFi Link 6050 Series (it's on lenovo X201).

If you have error like this

iwlagn 0000:02:00.0: firmware: requesting iwlwifi-6050-4.ucode
iwlagn 0000:02:00.0: firmware: requesting iwlwifi-6050-3.ucode
iwlagn 0000:02:00.0: firmware: requesting iwlwifi-6050-2.ucode
iwlagn 0000:02:00.0: firmware: requesting iwlwifi-6050-1.ucode
iwlagn 0000:02:00.0: firmware: requesting iwlwifi-6050-4.ucode
iwlagn 0000:02:00.0: firmware: requesting iwlwifi-6050-3.ucode
iwlagn 0000:02:00.0: firmware: requesting iwlwifi-6050-2.ucode
iwlagn 0000:02:00.0: firmware: requesting iwlwifi-6050-1.ucode

Check directory /lib/firmwares/
You should have file iwlwifi-6050-4.ucode there.

Download iwlwifi-6050*.tgz from here .
Untar it and copy file iwlwifi-6050-4.ucode to /lib/firmware
Then reboot Ubuntu