Thank you all for providing descriptions and solutions. My systems were upgraded from 9.10 where everything was working OK, and I was about to give up on Ubuntu when the systems didn't boot after upgrade.
computer 1: /var on separate file system, mounting /home from nfs, hangs consistently on boot, "fixed" by removing fstab entry and mounting /home in /etc/rc.local
computer 2: hmm, this is a special one... On one hand it is a perfectly normal dual-boot laptop, running Windows 7 and Ubuntu. On the other hand, that same Ubuntu partition is the disk of a virtual machine, so that I can run the same Ubuntu installation from within VirtualBox. Working OK when booting from BIOS, but was failing to boot from within VirtualBox until i moved the mount of a vboxsf share to rc.local.
Thank you all for providing descriptions and solutions. My systems were upgraded from 9.10 where everything was working OK, and I was about to give up on Ubuntu when the systems didn't boot after upgrade.
computer 1: /var on separate file system, mounting /home from nfs, hangs consistently on boot, "fixed" by removing fstab entry and mounting /home in /etc/rc.local
computer 2: hmm, this is a special one... On one hand it is a perfectly normal dual-boot laptop, running Windows 7 and Ubuntu. On the other hand, that same Ubuntu partition is the disk of a virtual machine, so that I can run the same Ubuntu installation from within VirtualBox. Working OK when booting from BIOS, but was failing to boot from within VirtualBox until i moved the mount of a vboxsf share to rc.local.