Stuck in emergency mode and nothing works?

Your /etc/fstab is wrong.

First, you don't need to mount Acer-specific or recovery partitions, or the CD-ROM.

So, I'd comment out these lines...

sudo -H gedit /etc/fstab

#Entry for /dev/sda3 :
#UUID=C85AA81A5AA806F2   /media/Acer ntfs-3g defaults,locale=en_US.UTF-8 0 0
# note that I commented this out and also changed the "00" to "0 0"

#Entry for /dev/sda4 :
#UUID=4ECAA8ECCAA8D18F   /media/Recovery ntfs-3g defaults,locale=en_US.UTF-8 0 0
# note that I commented this out and also changed the "00" to "0 0"

#/dev/sr0    /media/cdrom0   udf,iso9660 user,noauto 0   0

and change:

#Entry for /dev/sdb1 :
UUID=0C08B30A08B2F1B6   /media/DATA ntfs-3g defaults,locale=en_US.UTF-8 00

to this:

#Entry for /dev/sdb1 :
UUID=0C08B30A08B2F1B6   /media/DATA ntfs-3g defaults,locale=en_US.UTF-8 0 0
# note the change from "00" to "0 0"

that will fix your problem.

However, if you must keep sda4, then the correct line would be...

#Entry for /dev/sda4 :
UUID=003CAE413CAE3218   /media/Recovery ntfs-3g defaults,locale=en_US.UTF-8 0 0
# note the new UUID, and the "0 0" at the end of the line.

From my experience, if you have created a new partition or edited existing one, you may get this error. I had the same error some time back. If you happened to be in the the Emergency Mode and see that it cannot load some of your drives. It means that some of your device id have been changed. So, you have to update the id accordingly in /etc/fstab file. Then do the following steps.

1. Type your root password
2. cat /etc/fstab
3. blkid (show the device ids)
4. Now check which which UUID in /etc/fstab does not apper in blkid output
5. type 'nano /etc/fstab' and Comment out that line (Just put # infront of the line)
6. type 'reboot' (Now your problem should be fixed and after logging in successfully, you can add the current UUID in /etc/fstab file )

As an example, this is my output of /etc/fstab file, in which I simply commented out the line ( UUID=C3D1-3CB7 /windows vfat utf8,umask=007,gid=46 0 1), because the UUID=C3D1-3CB7 has been changed.