Linux partition not showing full size [closed] - linux

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I have a Linux system where the disk space shows as only 29Gb, but when I look at the partition with the parted - print command it shows as a 64Gb partition. I'm not sure if the remaining disk space is unallocated, mounted in other folders, stuck in "tmpfs" or how to add it to the primary partition. This is in Ubuntu 18.04 OS. I would like for the full 64 GB to be available at root. I appreciate any help!
When I run df -h, here are the results:
Filesystem Size Used Avail Use% Mounted on
udev 16G 0 16G 0% /dev
tmpfs 3.2G 1.2M 3.2G 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 29G 25G 2.7G 91% /
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/sda2 976M 81M 829M 9% /boot
/dev/sda1 511M 4.4M 507M 1% /boot/efi
tmpfs 3.2G 0 3.2G 0% /run/user/1000
Results of parted print command shows a 64GB partition:
Model: ATA MSH-64 (scsi)
Disk /dev/sda: 63.4GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 538MB 537MB fat32 boot, esp
2 538MB 1612MB 1074MB ext4
3 1612MB 63.3GB 61.7GB
Results of vgs command:
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <57.50g <28.75g
Results of the lvs command:
(talos-env) pradmin#pradmin:~$ sudo lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
ubuntu-lv ubuntu-vg -wi-ao---- 28.75g

Answer 1

Depending on the installation, the root partition might only use a part of the logical volume (LV).
Try the commands vgs and lvs to get information about your current setup. I assume that vgs shows about 30G free space. You can enlarge the root volume using lvresize. After this you need to adapt the file system. This depends on the file system type you are using. If you use extX then you might want to run resize2fs.
Edit based on the edited question:
Yes, everything can be done when the disk is mounted and in use.
BUT YOU NEED TO TAKE CARE ABOUT THE COMMANDS YOURSELF!!! A WRONG COMMAND MIGHT DESTROY YOUR SYSTEM.
PLEASE TAKE YOUR TIME TO MAKE YOURSELF COMFORTABLE WITH LVS BEFORE CHANGING THE SYSTEM.
There are many good tutorials which might help you, e.g.:
http://ryandoyle.net/posts/expanding-a-lvm-partition-to-fill-remaining-drive-space/

Answer 2

The guidance from Andreas proved helpful. I managed to resize the logical volume to the full size of the partition using the following commands and sequence.
Resources that I found helpful:
https://www.redhat.com/sysadmin/resize-lvm-simple
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/storage_administration_guide/ext4grow
root:~# lvs
  LV        VG        Attr       LSize   Pool Origin
Data%  Meta%  Move Log Cpy%Sync Convert
  ubuntu-lv ubuntu-vg -wi-ao---- <57.50g
 
Here you can see that the logical volume doesn't fill the full partition size
root:~# vgs
  VG        #PV #LV #SN Attr   VSize   VFree
  ubuntu-vg   1   1   0 wz--n- <57.50g <28.75g
Extend the logical volume to 100% of the free space, /dev/{VG FROM lvs CMD}/{LV FROM lvs CMD}
root:~# lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from 28.75 GiB (7360 extents) to <57.50 GiB (14719 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
Checked disk space and saw that it hadn't changed yet
root:~# df
Filesystem 1K-blocks Used
Available Use% Mounted on
udev 16390292 0 16390292 0% /dev
tmpfs 3284628 1164 3283464 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 29542388 25311328 2707348 91% /
tmpfs 16423128 0 16423128 0% /dev/shm
tmpfs 5120 0 5120 0% /run/lock
tmpfs 16423128 0 16423128 0% /sys/fs/cgroup
/dev/sda2 999320 82552 847956 9% /boot
/dev/sda1 523248 4492 518756 1% /boot/efi
tmpfs 3284624 0 3284624 0% /run/user/1000
Resize file system to full size of logical volume, use Filesystem name from df command above. Note this is an ext4 filesystem, you may have to use a different command for a different filesystem.
root:~# resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs 1.44.1 (24-Mar-2018)
Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line
resizing required
old_desc_blocks = 4, new_desc_blocks = 8
The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 15072256 (4k) blocks
long.
root:~# df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 16390292 0 16390292 0% /dev
tmpfs 3284628 1164 3283464 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 59211724 25319316 31128948 45% /
tmpfs 16423128 0 16423128 0% /dev/shm
tmpfs 5120 0 5120 0% /run/lock
tmpfs 16423128 0 16423128 0%
/sys/fs/cgroup
/dev/sda2 999320 82552 847956 9% /boot
/dev/sda1 523248 4492 518756 1% /boot/efi
tmpfs 3284624 0 3284624 0%
/run/user/1000