I have had this problem using an Asus P7P55D motherboard (Realtek PCIe GBE family integrated ethernet) while just trying Ubuntu 10.10 off the CD (not actually even installing Ubuntu).
The cold reboot fix worked for me. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/573259 Title: Ubuntu 10.04 makes RTL8111/8168B network card unusable until cold reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-release-notes/+bug/573259/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs