Re: "trying to resume from /dev/disk/by" Error when booting into Ubuntu
You are going to want to do the following to reinstall everything you removed:
and after that type
sudo apt-get install linux-sound-base alsa-utils alsa-base gdm fast-user-switch-apple gdm-guest-session ubuntu-desktop
and you computer will reboot and you should be back to normal.
BTW, that is not an error you posted. That is just a comment stating that the system has not found an image to resume from hibernate, so it will boot normally and not attempt to resume from hibernate.
"If a cluttered desk signs a cluttered mind, Of what, then, is an empty desk a sign?" -Albert Einstein.