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I am using ubuntu which if i plug in my visiontek usb modem it is not detected.please help to use the modem in ubuntu and give me the steps?!

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Maybe your are plugging your USB Modem in a USB 3.0 port. Some USB Modems doesn't work in USB 3.0 ports even with 2.0 compatibility. Try in a USB 2.0 port.

Source: Huawei Technologies E1552/E1800 (HSPA modem) enable mobile broadband not shown in network setting

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