I'm having the exact same problem, Internet being painfully unstable and slow. Running Ubuntu 13.10 amd64 and driver r8169 on 1000Mb/s. Just switched from Windows 7, didn't have any problems there.
I'm having the exact same problem, Internet being painfully unstable and slow. Running Ubuntu 13.10 amd64 and driver r8169 on 1000Mb/s. Just switched from Windows 7, didn't have any problems there.