Q:

Increase partition size on which Ubuntu is installed? 

I have Ubuntu installed on a drive.  The problem is it is running low on disk space.  This is installed on vmware.  I expanded the virtual drive and booted into ubuntu.  But when I opened gparted(sudo gparted), the move/resize option is unavailable.  This is the partition Ubuntu is installed on, but I need to resize it.  Any ideas?  I am comfortable using command line

A:

As a matter of fact, you CAN enlarge the root filesystem while Ubuntu is running (I learned this recently myself here) - this sounds incredible but it's true :)
Here's the list of steps for a simple scenario where you have two partitions, /dev/sda1 is an ext4 partition the OS is booted from and /dev/sdb2 is swap.  For this exercise we want to remove the swap partition an extend /dev/sda1 to the whole disk. 

As always, make sure you have a backup of your data - since we're going to modify the partition table there's a chance to lose all your data if you make a typo, for example. 
Run sudo fdisk /dev/sda 

use p to list the partitions.  Make note of the start cylinder of /dev/sda1
use d to delete first the swap partition (2) and then the /dev/sda1 partition.  This is very scary but is actually harmless as the data is not written to the disk until you write the changes to the disk.  
use n to create a new primary partition.  Make sure its start cylinder is exactly the same as the old /dev/sda1 used to have.  For the end cylinder agree with the default choice, which is to make the partition to span the whole disk. 
use a to toggle the bootable flag on the new /dev/sda1
review your changes, make a deep breath and use w to write the new partition table to disk.  You'll get a message telling that the kernel couldn't re-read the partition table because the device is busy, but that's ok. 

Reboot with sudo reboot.  When the system boots, you'll have a smaller filesystem living inside a larger partition.  
The next magic command is resize2fs.  Run sudo resize2fs /dev/sda1 - this form will default to making the filesystem to take all available space on the partition.  

That's it, we've just resized a partition on which Ubuntu is installed, without booting from an external drive.  

A:

Two Methods
1.  Tested in Ubuntu Server 16.04 to 18.10
After extending the volume in VMware ESXi (shutdown vm, backup/export vm, remove all snapshots, then increased number in disk size, take snapshot of vm again before following the next steps so you can revert mistake/error). 
The following example is extending volume on root partition on a system that is already using LVM. 

ssh into the system, switch to root and run cfdisk
 # cfdisk

After exiting cfdisk
 # fdisk -l /dev/sda 
 Disk /dev/sda: 20 GiB, 21474836480 bytes, 41943040 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
 Disklabel type: dos
 Disk identifier: 0xc8b647ff

 Device     Boot    Start      End  Sectors  Size Id Type
 /dev/sda1  *        2048   999423   997376  487M 83 Linux
 /dev/sda2        1001470 16775167 15773698  7.5G  5 Extended
 /dev/sda3       16775168 41943039 25167872   12G 8e Linux LVM (***** See new partition /dev/sda3*****)
 /dev/sda5        1001472 16775167 15773696  7.5G 8e Linux LVM

Reboot system before next step (or else you might get Device
 /dev/sda3 not found (or ignored by filtering))
 # shutdown now -r

Initialize the new volume
 # pvcreate /dev/sda3
   Physical volume "/dev/sda3" successfully created

Get the name of volume to extend
 # vgdisplay
   --- Volume group ---
   VG Name               linuxetc1-vg (***** this is vg i'm extending*****)
   System ID             
   Format                lvm2
   Metadata Areas        1
   Metadata Sequence No  3
   VG Access             read/write
   VG Status             resizable
   MAX LV                0
   Cur LV                2
   Open LV               2
   Max PV                0
   Cur PV                1
   Act PV                1
   VG Size               7.52 GiB
   PE Size               4.00 MiB
   Total PE              1925
   Alloc PE / Size       1925 / 7.52 GiB
   Free  PE / Size       0 / 0  
   ...

Extend volume group
 # vgextend linuxetc1-vg /dev/sda3
   Volume group "linuxetc1-vg" successfully extended

Extend root
 # lvextend -l+100%FREE /dev/linuxetc1-vg/root
   Size of logical volume linuxetc1-vg/root changed from 6.52 GiB (1669 extents) to 18.52 GiB (4741 extents). 
   Logical volume root successfully resized. 

 Or if you only wanted to give 5 more GB to root
 # lvextend -L +5g /dev/linuxetc1-vg/root

Get filesystem name for next step
 # df -h
 Filesystem                      Size  Used Avail Use% Mounted on
 udev                            477M     0  477M   0% /dev
 tmpfs                           100M  4.6M   95M   5% /run
 /dev/mapper/linuxetc1--vg-root  6.3G  2.5G  3.5G  42% /            (***** this line*****)
 tmpfs                           497M     0  497M   0% /dev/shm
 tmpfs                           5.0M     0  5.0M   0% /run/lock
 tmpfs                           497M     0  497M   0% /sys/fs/cgroup
 /dev/sda1                       472M  105M  343M  24% /boot
 tmpfs                           100M     0  100M   0% /run/user/1000

Extend filesystem
 # resize2fs /dev/mapper/linuxetc1--vg-root
 resize2fs 1.42.13 (17-May-2015)
 Filesystem at /dev/mapper/linuxetc1--vg-root is mounted on /; on-line resizing required
 old_desc_blocks = 1, new_desc_blocks = 2
 The filesystem on /dev/mapper/linuxetc1--vg-root is now 4854784 (4k) blocks long. 

See the increased size
 # df -h
 Filesystem                      Size  Used Avail Use% Mounted on
 udev                            477M     0  477M   0% /dev
 tmpfs                           100M  4.6M   95M   5% /run
 /dev/mapper/linuxetc1--vg-root   19G  2.5G   15G  15% /         (***** this line*****)
 tmpfs                           497M     0  497M   0% /dev/shm
 tmpfs                           5.0M     0  5.0M   0% /run/lock
 tmpfs                           497M     0  497M   0% /sys/fs/cgroup
 /dev/sda1                       472M  105M  343M  24% /boot
 tmpfs                           100M     0  100M   0% /run/user/1000

2.  Faster Method Tested in Ubuntu Server 18.04.3 LTS
This method is a little faster than the first.  This is due to a new option in the cfdisk menu called "Resize" that saves some steps.  
After extending the volume in VMware ESXi (shutdown vm, backup/export vm, remove all snapshots, then increased number in disk size, take snapshot of vm again before following the next steps so you can revert mistake/error). 
The following example is extending volume on root partition on a system that is already using LVM. 

ssh into the system, switch to root and run cfdisk. 
Choose the partition to extend and select "Resize". 

Set the "New size". 

After pressing enter, you'll see screen with the following note "Partition [someNumber] resized":

Next you'll need to "Write" (save) your changes:

Quit cfdisk.  When you exit you may see message "syncing disks". 

I rebooted my system at this point but it may not be necessary.  Now you can pickup from step 19 from the first method (repeated below). 
(19) Get filesystem name for next step
 # df -h
 Filesystem                      Size  Used Avail Use% Mounted on
 udev                            477M     0  477M   0% /dev
 tmpfs                           100M  4.6M   95M   5% /run
 /dev/mapper/linuxetc1--vg-root  6.3G  2.5G  3.5G  42% /            (***** this line*****)
 tmpfs                           497M     0  497M   0% /dev/shm
 tmpfs                           5.0M     0  5.0M   0% /run/lock
 tmpfs                           497M     0  497M   0% /sys/fs/cgroup
 /dev/sda1                       472M  105M  343M  24% /boot
 tmpfs                           100M     0  100M   0% /run/user/1000

(20) Extend filesystem
 # resize2fs /dev/mapper/linuxetc1--vg-root
 resize2fs 1.42.13 (17-May-2015)
 Filesystem at /dev/mapper/linuxetc1--vg-root is mounted on /; on-line resizing required
 old_desc_blocks = 1, new_desc_blocks = 2
 The filesystem on /dev/mapper/linuxetc1--vg-root is now 4854784 (4k) blocks long. 

(21) See the increased size
 # df -h
 Filesystem                      Size  Used Avail Use% Mounted on
 udev                            477M     0  477M   0% /dev
 tmpfs                           100M  4.6M   95M   5% /run
 /dev/mapper/linuxetc1--vg-root   19G  2.5G   15G  15% /         (***** this line*****)
 tmpfs                           497M     0  497M   0% /dev/shm
 tmpfs                           5.0M     0  5.0M   0% /run/lock
 tmpfs                           497M     0  497M   0% /sys/fs/cgroup
 /dev/sda1                       472M  105M  343M  24% /boot
 tmpfs                           100M     0  100M   0% /run/user/1000

Articles:
https://wiki.ubuntu.com/Lvm
http://www.geoffstratton.com/expand-hard-disk-ubuntu-lvm 

A:

You are almost there. 
You can not resize the partition using GParted while Ubuntu is running. 
You will need to attach the GParted ISO's as a CD to the VM machine and reboot the machine so that the GParted will be loaded instead of Ubuntu (I think you can boot from the virtual CD by pressing F12 immediately after machine is started). 
Once you booted into GParted the option to move/resize will be enabled as Ubuntu is not currently running.