linux – Extending a partition in ubuntu 14

I’ve been trying to follow several of the guides and articles on this forum and others on how to extend my current Linux LVM partition.

Here are the current partitions I have. I don’t understand how both sda2 and sda5 are the same blocks is my first issue. And my second is that I don’t know which to select to extend?

:/var$ sudo fdisk -l

Disk /dev/sda: 2199.0 GB, 2199023255552 bytes
255 heads, 63 sectors/track, 267349 cylinders, total 4294967296 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005011b

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 499711 248832 83 Linux
/dev/sda2 501758 1782577151 891037697 5 Extended
/dev/sda5 501760 1782577151 891037696 8e Linux LVM

Disk /dev/mapper/webserver–vg-root: 908.1 GB, 908129730560 bytes
255 heads, 63 sectors/track, 110407 cylinders, total 1773690880 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/webserver–vg-root doesn’t contain a valid partition table

Disk /dev/mapper/webserver–vg-swap_1: 4290 MB, 4290772992 bytes
255 heads, 63 sectors/track, 521 cylinders, total 8380416 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/webserver–vg-swap_1 doesn’t contain a valid partition table

How do I extend these properly without risking losing data? I am concerned I am going to mess up this server and its contents.

Thank you