Since posting the above comments, I managed to get Ubuntu to boot once and, at that time, I invoked Update Manager to bring everything up to date. Since then Ubuntu boots fine but I still get this error message at the same stage of the boot process as before. But the boot process continues and Ubuntu seems to work okay. This is all very strange.
-- shpchp cannot reserve mmio region https://bugs.launchpad.net/bugs/577842 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs