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Internet stops working after some time in Ubuntu 14.04

Asked by Harsh

After I log in to Ubuntu, internet works fine for some time (for around 45 mins or so, it varies) but then it suddenly stops working (though wireless shows connected). I'm on 14.04 now and I've faced similar problem in 13.10. Even "ping www.google.com" in terminal gives "host not found" error.
I get a dialog box which says "A system problem as occurred" and then internet crashes. I'm connected using Wifi, but I face the same issue when connected using ethernet cable.

I'm using dual boot with Windows 8.1

Please ask me any details which can help in diagnosing the issue.

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Harsh (harshjha2006) said : 		#1

In case the following info would be helpful -

xxxxx@xxxxx:~$ dmesg | grep -e eth0 -e IPv -e dns -e DNS
[ 0.916577] Key type dns_resolver registered
[ 0.971509] r8169 0000:03:00.0 eth0: RTL8168evl/8111evl at 0xffffc90000c6c000, 18:67:b0:27:02:c6, XID 0c900800 IRQ 42
[ 0.971511] r8169 0000:03:00.0 eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]
[ 21.263215] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 38.285078] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 38.285367] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 38.902926] r8169 0000:03:00.0 eth0: link down
[ 38.902980] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 38.903587] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 68.481224] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

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actionparsnip (andrew-woodhead666) said : 		#2

Can you ping 8.8.8.8 after the issue occurs?

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Harsh (harshjha2006) said : 		#3

Waiting for the problem to reoccur, would update the thread as soon as it occurs.

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Harsh (harshjha2006) said : 		#4

I cannot ping 8.8.8.8 after the issue -

xxxx@xxxx:~/tmp$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted

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Launchpad Janitor (janitor) said : 		#5

This question was expired because it remained in the 'Open' state without activity for the last 15 days.