You can solve this manually:
During boot write down the UUID of the drive and press S to skip mounting the drive.
Open the terminal window and type:
sudo gedit /etc/fstab
Locate the entry with the UUID you wrote down and put a dash (#) before that line to disable it. The file will look something like this and I highlighted the line that I disabled:
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
#Entry for /dev/sda1 :
UUID=31b7ed42-80c5-4d3e-ab89-fd5fb6cbc7df /..........
#Entry for /dev/sdc5 :
#UUID=15DB122A7DAE9399 /.........
#Entry for /dev/sda5 :
UUID=db6830a1-c2f8-4f7a-b04b-3b3662c2455d none swap sw 0 0
Save the file and at the next reboot no questions asked 
You get this message because you disconnected that disc and is still mounted when the system is booting.
Good luck!
Bookmarks