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Please help me i am unable to connect to internet. When i connect using network manager i connects only once the it does not detect my modem.

Abhishek Rana
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  • Windows sets up virtual com ports for USB devices. lsusb -t will provide a tree showing how all your usb devices are connected. I hope this clarifies things for you – Elder Geek Mar 10 '15 at 16:04
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    Welcome to askubuntu! Your question would be clearer if you were to add details like what you tried to fix it and what happened when you did. I can only hope my answer is helpful as the information you've provided is a bit limited. In future please help us help you by reviewing http://askubuntu.com/help/how-to-ask You are likely to get usable answers a lot faster if you follow those guidelines. I thank you and the community thanks you! – Elder Geek Mar 10 '15 at 16:38
  • I wish it would Elder – Abhishek Rana Mar 17 '15 at 07:57

2 Answers2

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You can get a tree of USB devices with lsusb -t

/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 1: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/8p, 480M

True serial ports can be detected with the command dmesg | grep tty

[    0.000000] console [tty0] enabled
[    0.526866] 00:07: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A

You can set and/or report serial information with sudo setserial -g /dev/ttyS[0123]

/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
/dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3
/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3

if setserial isn't installed already you can install it with sudo apt-get install setserial

Elder Geek
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Execute following command in terminal :

lsusb

It will look like this enter image description here

You see the device 004 : .... shows logitech Inc, it is the port where my usb mouse is attached, check your usb devices and see the name of your modem corresponding to device 00X.

Check this for more info

Faizan Akram Dar
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