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Yesterday I have upgraded to Ubuntu 13.04. After I upgrade, I have a serious problem with network (I use wire network): my network is unstable. After a short time using it, it often disconnects. It means the connected sign on taskbar is normal, but I can not browse the internet anymore.

The only solution that I have is unplug network, and plug again, and network runs smoothly again. I don't know why this happen and I google but no answer.

I'm using laptop with core i5, and network card is onboard.

Here is my network card info after I run command : sudo lshw -C network

       description: Wireless interface
       product: AR9285 Wireless Network Adapter (PCI-Express)
       vendor: Atheros Communications Inc.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 01
       serial: d0:df:9a:e2:81:c7
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=ath9k driverversion=3.8.0-19-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
       resources: irq:17 memory:c0500000-c050ffff
       description: Ethernet interface
       product: AR8151 v2.0 Gigabit Ethernet
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: eth0
       version: c0
       serial: e8:9a:8f:b9:af:57
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion= duplex=full ip= latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:49 memory:c0400000-c043ffff ioport:2000(size=128)

And here is my laptop information:

System Information
        Manufacturer: TOSHIBA
        Product Name: Satellite L755
        Version: PSK1YL-006001
        Serial Number: 9B077988W
        UUID: 2690FBA0-D81A-11E0-9FD1-E89A8FB9AF57
        Wake-up Type: Power Switch
        SKU Number: PSK1YL-006001
        Family: Intel_Mobile

Please help me about this issue.

share|improve this question
Please tell us your networking setup and what kind of network card you do have. –  schaiba Apr 27 '13 at 15:06
can you tell me how to do that. because i'm a newcommer to linux world. thanks :) –  hqt Apr 27 '13 at 15:42
but, i meet this problem after upgrade to ubuntu 13.05. before that is normal. Before I use Ubuntu, I use Fedora and still meet this situation :( –  hqt Apr 27 '13 at 15:43
I think what everyone is looking for is what type of hardware do you have? Try to be as specific as possible, model numbers, brand name, etc. Let's start with that, we'll need you to do some additional information collection in order to get to the root of the problem, so be prepared 8-). –  slm Apr 27 '13 at 16:12
@slm I have added a little information about my netword card. –  hqt Apr 27 '13 at 16:28

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