There is a start job that run's when Debian or Ubuntu first boots up and it holds the system up for 1 minute and 30 seconds due to an old swap partition.
When the system boots you'll see the message that says:
***a start job is running for dev-disk-by uuid disk-partition-uuid>
(the uuid is usually a really long number)
Write down that long number while the system is being held up so you will know which partition to un-comment in the /etc/fstab file.
This has happened on my triple booted system repeatedly and this is how I fixed it.
Open the terminal as root and use nano or your favorite text editor to edit your /etc/fstab file. Here's a screenshot of what I'm talking about.
To get to that file type at the terminal prompt:
sudo nano /etc/fstab and press Enter than type in your password and hit Enter.
When that file opens it will be open as root administrator so be careful and move slow. Arrow down to the partition with the UUID that you need.
On the line 3rd from the bottom you'll see:
#UUID=9c3db599-3165-4b43-8139-25b39ad701d1
That is the swap partition that the system was complaining about a start job running during boot time.
When I first opened that file it did not have a # sign in front of the UUID, so I used the down arrow key and placed it on the first U in UUID and added the # sign.
Once you add the # sign in front of that UUID you can close nano but you need to save it first.
Hold down the CTRL key plus the letter o key at the same time. (it will highlight a message at the bottom of nano) Press the Enter key one time and than hold down the CTRL key plus the x key and the terminal will save and exit the file you just edited. Close the terminal and reboot.
And that's how you fix that start job from holding up the boot process.