I have just had a major issue with my Ubuntu 11.04 Natty which I think is going to end up in a reinstall :-(

This is problem one of two so I've put them as two questions.

For some unknown reason I had a Distribution update on my Laptop yesterday which for all intend and purposes did nothing.
No major version changes except in Evolution and LibreOffice plus some of the GNOME environment (my other question).

Now, whenever I boot my machine I receive this message

could not mount /dev/mapper/cryptswap1 M for manual S for skip

What would have caused this error and what on earth is Cryptswap1?

# /etc/fstab: static file system information.

#

# Use 'blkid -o value -s UUID' to print the universally unique identifier

# for a device; this may be used with UUID= as a more robust way to name

# devices that works even if disks are added and removed. See fstab(5).

#

# <file system> <mount point>   <type>  <options>       <dump>  <pass>

proc            /proc           proc    nodev,noexec,nosuid 0       0

# / was on /dev/sda1 during installation

UUID=c3cff8dd-1bf2-4618-8801-761b335c8d38 /               ext4    errors=remount-ro 0       1

# swap was on /dev/sda5 during installation

#UUID=fe10641d-a928-479e-ab3a-b0706b97b601 none            swap    sw              0       0

/dev/mapper/cryptswap1 none swap sw 0 0

sudo blkid | grep swap

/dev/mapper/cryptswap1: TYPE:"swap"

Crypttab

# <target name> <source device> <key file> <options>

ls -l /dev/mapper

total 0

crw------- 1 root root 10, 236 2011-08-16 05:28 control

Filename Type Size Used Priority

/dev/sda5 partition 1038332 86760 -1