ubuntu 15.04 / 15.10 - A start job is running for dev-disk-by (slow boot)

After I upgraded to xubuntu 15.04 vivid my computers were booting extremely slowly.  I didn't panic, just waited for them to boot and started searching for answers.

Hit      during boot to see what the error message is.


 Mine showed this:
"a start job is runnning for dev-disk-by \ x2duuid-xxxx \"

So the easy fix:
swapon -s to see which drive is really your swap disk.

sudo gedit /etc/fstab
and comment out the swap file that was used during installation. Reboot, and all should be fine.

Other notes:

• You can also run:  swapon -s   to see which one is really your swap partition.
• run:  sudo blkid  to see the UUID info of your drives.
• run:  systemd-analyze critical-chain  and  systemd-analyze blame  see what is slow during start up.
• systemd for ubuntu
• 15.04 Vivid release notes