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I used to connect to the internet using my usb-modem in the earlier versions of ubuntu. But after installing precise i'm not able to connect to the internet. Please help. I don't want to use windows but forced to do so.

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Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. – Jorge Castro May 1 '12 at 19:30
usb-modem : micromax mmx352g. machine: hp G-42. sometimes i used a third party software named "sakis3G". but now if i'm using it , it shows segmentation fault and core dumped thus disabling that software also. – deathholes May 2 '12 at 17:07
problem solved. link: – deathholes May 3 '12 at 9:36
Can you summarize that thread and post a final solution here so that people searching can find the solution? – Jorge Castro May 3 '12 at 18:51

The OP reported solving the problem by using information in this forum thread:

No additional information was provided about what part of the thread was helpful, but it may have been this post by AlexFish.

Those instructions were, in summary:

  1. Run lsusb to get the device's identifying numbers. Replace each instance of 1C9E and 9605 below with the correct values for the device on your system, as revealed in this step.

  2. Edit the file /usr/bin/option_1C9E:9605 as root, giving it the contents:

    #! /bin/bash
    echo 1C9E 9605 > /sys/bus/usb-serial/drivers/option1/new_id
  3. Make it executable:

    chmod +x /usr/bin/option_1C9E:9605
  4. Edit /etc/udev/rules.d/option.rules as root, adding:

    ATTRS{idVendor}=="1c9e", ATTRS{idProduct}=="9605", RUN+="/sbin/modprobe option"
    ATTRS{idVendor}=="1c9e", ATTRS{idProduct}=="9605", RUN+="/usr/bin/option_1C9E:9605"
  5. It may work immediately; otherwise unplug it from the machine and plug it back in.

Concept and commands taken directly from the post; explanation and formatting redone.

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