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Ubuntu 12.04 LTS Beta 2 cann't detect my 3G USB Modem. But previously when I used Ubuntu 11.10, it automatically detected it. Please help me out!!!!!

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We need alot more information. Start with brand of your system and brand of your USB modem. Have a look around AU for similar questions and pay attention to commands people ask about in comments. Examples: askubuntu.com/questions/99737/list-of-usb-modems-supported askubuntu.com/questions/106647/… – Rinzwind Apr 20 '12 at 6:10
@Rinzwind thanks. If someone wants to send me some of this hardware that never works, I'm happy to troubleshoot it. I just can't help a lot when stuff is this vague – Call me V Apr 20 '12 at 7:12
Welcome to Ask Ubuntu! This question should instead be filed as a bug report, thanks! Instructions here. – Jorge Castro Apr 22 '12 at 19:07

closed as off topic by fossfreedom♦ May 16 '12 at 19:37

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3 Answers

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I had the same problem in the final release 12.04LTS (64bit-desktop version) that I downloaded today. I added "options" without quotes as a new line to /etc/modules file and on reboot my 3G USB modem started working.

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I have the same problem with a vodafone Huawei K3770 USB modem after upgrading to 12.04 precise last night. It worked fine on 11.04 and 11.10

lsusb output: Bus 002 Device 012: ID 12d1:1c05 Huawei Technologies Co., Ltd.

/lib/udev/rules.d/40-usb_modeswitch.rules :

#Vodafone/Huawei K3770 ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1c05", RUN+="usb_modeswitch '%b/%k'"

usb_modeswitch.conf:

DefaultVendor= 0x12d1 DefaultProduct=0x14d1

TargetVendor= 0x12d1 TargetProduct= 0x1c05

CheckSuccess=20

MessageContent="55534243123456780000000000000011060000000000000000000000000000"

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issue resolved:

edited the /usr/share/usb_modeswitch configuration file with the correct target ID and messageContent other than the listed above with the contents from device_reference.txt found here: http://www.draisberghof.de/usb_modeswitch/device_reference.txt

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