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Did you delete your fstab file in ubuntu 16.04 ?


 
Possible result would be hang your booting at a black screen. 

Fix would be restoring the fstab file. Unfortuanatly if you don’t have a back up file have to recreate the file manually. 

You should be able to go to recovery mode by pressing esc button till boot option menu appears. 


Then select advance options and then select recovery mode. 

https://i.stack.imgur.com/MQv6f.png

Then should see a white ui window. 

enter image description here
Select Update grub bootloader to to get read write access to file system. Then select drop to root shell prompt.

Now sudo blkid file get partition info 

sudo blkid
 
/dev/sda1: UUID="78985254-78ae-45b3-923d-804c7d56a7dc" TYPE="ext4" PARTUUID="ab55e511-01"
/dev/sda2: UUID="a30e14b5-0203-4ef3-a135-2dad9c26c309" TYPE="swap" PARTUUID="ab55e511-02"
/dev/sda3: UUID="377ce2fa-29c3-46d2-87da-88ff55502d66" TYPE="ext4" PARTUUID="ab55e511-03"
Since copy paste is not possible you will have to manual enter uuid s. better take a photo of those blkid... info and insert them to fstab file as following. Now crete fstab file with those info. since i am having two partitions above info is shown. sda1 is considered as root folder. sda3 becomes the home as the way i have configured it.


update the fstab file as following. 

 UUID=78985254-78ae-45b3-923d-804c7d56a7dc / ext4 errors=remount-ro 0 1 UUID=a30e14b5-0203-4ef3-a135-2dad9c26c309 none swap sw 0 0 UUID=377ce2fa-29c3-46d2-87da-88ff55502d66 /home ext4 defaults 0 2 

If you configured to have home directory in a different location line 3 will show that. if you did not configured home partition properly you will be able to go to login page but will allow to login to desktop as existing user. Could be logged in a s guest.
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