Comment 16 for bug 771857

This keeps happening to me occasionally, less than one out of ten times. Over the last several Ubuntu releases, "sudo ifconfig eth0 down" followed by "sudo ifconfig eth0 up" has always been enough to re-establish connectivity. A long time ago, I sometimes had to unload and reload the r8169 module.

This was the first time this bug happened in Ubuntu 15.04. I just filed a new report using "ubuntu-bug linux": https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1453404

As a workaround, I'm installing the r8168-dkms package, which includes the proprietary Realtek driver.