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 :
#Entry for /dev/sdc5 :
#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.