Akila,
Please try the above-mentioned fix; let me know if this works for you :)
** Changed in: network-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/868034
Title:
Huawei E220 can't connect on Ubuntu 11.10
Status in “network-manager” package in Ubuntu:
Incomplete
Bug description:
I'm using Ubuntu in my HP Pavilion dv6745tx laptop. I cannot connect
the Huawei E220 usb modem since 11.10 beta1 (now I'm in beta2). There
is no problem in natty.
I have found this in syslog
Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0)
starting connection 'Dialog GSM Postpaid'
Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> (ttyUSB0): device state
change: disconnected -> prepare (reason 'none') [30 40 0]
Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0)
Stage 1 of 5 (Device Prepare) scheduled...
Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0)
Stage 1 of 5 (Device Prepare) started...
Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0)
Stage 1 of 5 (Device Prepare) complete.
Oct 5 07:10:58 ubuntu NetworkManager[1681]: <warn> GSM connection failed:
(32) Sending command failed: 'Resource temporarily unavailable'
Oct 5 07:10:58 ubuntu NetworkManager[1681]: <info> (ttyUSB0): device state
change: prepare -> failed (reason 'unknown') [40 120 1]
Oct 5 07:10:58 ubuntu NetworkManager[1681]: <warn> Activation (ttyUSB0)
failed.
Oct 5 07:10:58 ubuntu NetworkManager[1681]: <info> (ttyUSB0): device state
change: failed -> disconnected (reason 'none') [120 30 0]
Oct 5 07:10:58 ubuntu NetworkManager[1681]: <info> (ttyUSB0): deactivating
device (reason: 0).
Oct 5 07:10:58 ubuntu NetworkManager[1681]: nm_system_iface_flush_routes:
assertion `ifindex > 0' failed
Oct 5 07:10:58 ubuntu NetworkManager[1681]: nm_system_iface_flush_addresses:
assertion `ifindex > 0' failed
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