After I log in to Ubuntu, internet works fine for some time (for around 45 mins or so) but then it suddenly stops working. I'm on 14.04 now and I've faced similar problem in 13.10.

I'm connected using Wifi, but I face the same issue when connected using ethernet cable.

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

I get a dialog box which says "A system problem as occurred" and then internet crashes.

From /var/log/syslog -

cat /var/log/syslog | grep NetworkManager | grep error
Apr 10 01:50:55 <machine-name> NetworkManager[832]: <warn> error monitoring device for netlink events: No buffer space available
Apr 10 02:06:36 <machine-name> NetworkManager[760]: <error> [1397113596.497261] [nm-dns-dnsmasq.c:400] update(): dnsmasq owner not found on bus: Could not get owner of name 'org.freedesktop.NetworkManager.dnsmasq': no such name

From dmesg | grep -e eth0 -e IPv -e dns -e DNS -

dmesg | grep -e eth0 -e IPv -e dns -e DNS
[    0.920865] Key type dns_resolver registered
[    0.976650] r8169 0000:03:00.0 eth0: RTL8168evl/8111evl at 0xffffc90000c2a000, 18:67:b0:27:02:c6, XID 0c900800 IRQ 42
[    0.976652] r8169 0000:03:00.0 eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]
[   23.017231] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   34.125468] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   34.125715] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   34.672505] r8169 0000:03:00.0 eth0: link down
[   34.672562] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   34.672927] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   41.473249] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

closed as off-topic by bain, chaskes, Warren Hill, Wilf, psusi Jul 29 '14 at 13:25

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This describes a problem that can't be reproduced that seemingly went away on its own or was only relevant to a very specific period of time. It's off-topic as it's unlikely to help future readers." – bain, Warren Hill, Wilf, psusi
If this question can be reworded to fit the rules in the help center, please edit the question.


I think the driver you are using is buggy

Check Additional Drivers and install best available driver. If this solves the problem excellent. probably you've done this already? I see your wireless chip is being reported as RTL8168evl/8111evl. I don't believe this is correct as Realtek doesn't appear to make that model. Identify the wireless chip either by checking with the manufacturer of your laptop or by visual inspection.

Download the correct linux driver from http://www.realtek.com/downloads/downloadsView.aspx?Langid=1&PNid=13&PFid=21&Level=4&Conn=3

compile and install in accordance with the manufacturers instructions.


This could also fix the problem.

This is a very very VERY Annoying bug! Which needs sorting out...

Open terminator and enter the following lines:

sudo modprobe ath5k nohwcrypt
sudo sh -c "echo 'options ath5k nohwcrypt' >/etc/modprobe.d/custom-wireless.conf"
sudo apt-get remove libnss-mdns

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