Much to my surprise I recently found myself to lack a swap partition.

Since (as is evident from the output of df, which I hereby repost) that I am running off a single encrypted volume, I was wondering how I can safely go about resizing everything and creating an 8 GB partition for use as a swap (and enabling it's use). I seem to remember that the scheme I opted for during installation is LUKS.

user@host:~$ df

Filesystem                  1K-blocks     Used Available Use% Mounted on

/dev/mapper/ubuntu--vg-root 237978256 14144120 211722472   7% /

none                                4        0         4   0% /sys/fs/cgroup

udev                          3829132        4   3829128   1% /dev

tmpfs                         3844736     2060   3842676   1% /tmp

tmpfs                          768948     1324    767624   1% /run

none                             5120        0      5120   0% /run/lock

none                          3844736    32312   3812424   1% /run/shm

none                           102400       28    102372   1% /run/user

tmpfs                         3844736        0   3844736   0% /var/spool

tmpfs                         3844736       24   3844712   1% /var/tmp

tmpfs                         3844736      936   3843800   1% /var/log

/dev/sda1                      240972    84550    143981  37% /boot

/home/user/.Private        237978256 14144120 211722472   7% /home/user

user@host:~$ 

I'm a little out of my depth and I intuit that there's ample opportunity for disaster so I'd much appreciate some assistance. (And, though I would be disappointed if I accidentally nuked the drive, this is just a personal laptop with nothing criticcal on it, so I could always start over).