Comment 4 for bug 435874

I faced the same problem after upgrade to 9.10 - empty /etc/resolv.conf after reboot, ifdown eht0 && ifup eth0 resolves the issue.

I googled old bug 31057 which blames resolvconf package and in fact I noticed that I had this package installed. So I removed it and I am just to reboot to check whether it helps.