I need to resize the disk space of an ubuntu guest in VMWare Workstation. After using the expand disk utility in vmware workstation, I need to do some linux magic to resize the parition. I have searched and found a lot of posts about resizing it. Unfortunately I don't really understand it all that well. Can anyone help me out with this?

df -h gives me:

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/ubuntu-root
                       19G  2.6G   16G  15% /
none                  496M  172K  495M   1% /dev
none                  500M     0  500M   0% /dev/shm
none                  500M   64K  500M   1% /var/run
none                  500M     0  500M   0% /var/lock
none                  500M     0  500M   0% /lib/init/rw
none                   19G  2.6G   16G  15% /var/lib/ureadahead/debugfs
/dev/sda1             228M   36M  181M  17% /boot

lvs says:

  LV     VG     Attr   LSize   Origin Snap%  Move Log Copy%  Convert
root   ubuntu -wi-ao  18.88g
swap_1 ubuntu -wi-ao 884.00m

fdisk -l says:

Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00033718

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          32      248832   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              32        2611    20719617    5  Extended
/dev/sda5              32        2611    20719616   8e  Linux LVM

I really appreciate the help.