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I have been using Huawei USB modem to connect to internet in Ubuntu 12.04 and earlier without any problem but it continuously disconnects in Ubuntu 13.04. Sometimes the network is shown connected but without any internet connection. I have to restart my PC or remove the mobile broadband connection in connection manager and make a new one to be able to connect to the network. Moreover, sometimes after this problem the network manager applet just crashes. Network manager also gives some odd names to my mobile broadband connection, e.g. Label Empty, Yes, noname and and sometimes it doesn't show any name but just empty space. This is a fresh install and I've also re-installed but the problem persists.

I am using Ubuntu 13.04 (32-bit) on Acer Aspire One AOD255.

dmesg | tail outout:

sixline@ali-AOD255:~$ dmesg | tail
[ 3031.089622] option 2-2:1.2: GSM modem (1-port) converter detected
[ 3031.090412] usb 2-2: GSM modem (1-port) converter now attached to ttyUSB2
[ 3031.092314] scsi12 : usb-storage 2-2:1.3
[ 3032.096172] scsi 12:0:0:0: CD-ROM            HUAWEI   Mass Storage     2.31 PQ: 0 ANSI: 0
[ 3032.099176] scsi 12:0:0:1: Direct-Access     HUAWEI   SD Storage       2.31 PQ: 0 ANSI: 2
[ 3032.123177] sr0: scsi-1 drive
[ 3032.123619] sr 12:0:0:0: Attached scsi CD-ROM sr0
[ 3032.124046] sr 12:0:0:0: Attached scsi generic sg1 type 5
[ 3032.129183] sd 12:0:0:1: Attached scsi generic sg2 type 0
[ 3032.144186] sd 12:0:0:1: [sdb] Attached SCSI removable disk
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Edit your question and include result of dmesg | tail when the modem disconnects. –  Web-E Jul 24 '13 at 11:41
Ok..I'll wait for it to disconnect. –  sixline Jul 24 '13 at 12:04
Ok, today it happened again so I have pasted the dmesg | tail output. –  sixline Jul 26 '13 at 9:41
Anyone please?? –  sixline Jul 30 '13 at 7:16
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