Thanks Stefan, I have confirmed that the following kernels work.
linux-image-2.6.38-11-server_2.6.38-11.48+lp795717v1_amd64.deb linux-image-2.6.38-11-generic_2.6.38-11.48+lp795717v1_amd64.deb They were installed on three machines Dell PowerEdge R710 with 96GB ram and 2 * Xeon X5680 Dell PowerEdge 2950 with 32GB ram and 2 * Xeon E5420 Dell OptiPlex 960 with 8GB ram and 1 * Core2 Duo E8400 I can install and boot the following operating systems, all with 8 vcpus. Ubuntu 8.04 server i386 (current_clocksource was tsc) Ubuntu 10.10 desktop i386 RHEL 5.4 i386 RHEL 5.5 i386 (boot existing image only) Centos 5.5 i386 Centos 5.5 amd64 Centos 5.6 i386 LiveCD (no install) I also had no issues booting 64bit windows 7 guests with two vcpus. Thanks, Greg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/795717 Title: 32bit rhel and centos 5.(5|6) hangs on boot on natty To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/795717/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs