[ubuntu] Problem with internet connection - 12.04

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http://ubuntuforums.org – I have Windows Vista and Ubuntu 12.04 installed on my Dell D630 laptop. I'm using Huawei MT882 modem. I have installed Ubuntu 2 days ago using wubi. I have tried with USB or ADSL cable but on Ubuntu, internet connection won't work. On Windows however, it works perfectly (both USB and ADSL cable) Is there any way to fix this problem ? (Hardware)