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I have Ubuntu Server 18.04 LTS running off a 16GB SanDisk USB pendrive in my server. From what I can remember, when I installed Ubuntu on there I had enabled LVM support. For some reason, when I ssh into my server, it says / is using 99.6% of 3.87GB, but doing sudo fdisk -l /dev/sdm says:

Disk /dev/sdm: 14.6 GiB, 15664676864 bytes, 30595072 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: gpt

Disk identifier: 7DF91AEG-9DE1-43B2-A7C7-EB564B51FEB2



Device       Start      End  Sectors  Size Type

/dev/sdm1     2048     4095     2048    1M BIOS boot

/dev/sdm2     4096  2101247  2097152    1G Linux filesystem

/dev/sdm3  2101248 30593023 28491776 13.6G Linux filesystem

And output from (parted) print with /dev/sdm selected gives me:

Model: SanDisk Cruzer Glide (scsi)

Disk /dev/sdm: 15.7GB

Sector size (logical/physical): 512B/512B

Partition Table: gpt

Disk Flags: 



Number  Start   End     Size    File system  Name  Flags

 1      1049kB  2097kB  1049kB                     bios_grub

 2      2097kB  1076MB  1074MB  ext4

 3      1076MB  15.7GB  14.6GB

Running sudo df -h gives me:

Filesystem                         Size  Used Avail Use% Mounted on

udev                                12G     0   12G   0% /dev

tmpfs                              2.4G  241M  2.2G  10% /run

/dev/mapper/ubuntu--vg-ubuntu--lv  3.9G  3.9G     0 100% /

tmpfs                               12G     0   12G   0% /dev/shm

tmpfs                              5.0M     0  5.0M   0% /run/lock

tmpfs                               12G     0   12G   0% /sys/fs/cgroup

/dev/loop0                          90M   90M     0 100% /snap/core/6034

/dev/loop1                          90M   90M     0 100% /snap/core/6130

/dev/sdm2                          976M  155M  755M  17% /boot

tmpfs                              2.4G     0  2.4G   0% /run/user/1000

/dev/loop3                          92M   92M     0 100% /snap/core/6259

I have left out my ZFS volume above, as it's unnecessary to include it.

Running sudo vgs gives me:

  VG        #PV #LV #SN Attr   VSize  VFree

  ubuntu-vg   1   1   0 wz--n- 13.58g 9.58g

And, lastly, running sudo lvs gives me:

  LV        VG        Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert

  ubuntu-lv ubuntu-vg -wi-ao---- 4.00g                                                    

/dev/sdm is my root drive by the way. Any insight to this would be helpful. I do have ZFS installed managing other disks, but / is ext3 or 4.

One other thing to note is that I have LVM enabled because if my USB drive were to ever go bad I wanted to be able to restore the data to a new drive, whether it is smaller or larger than 16GB, and utilize the whole disk.

As you can see, there's about 9.58 GiB free in your volume group, so that's how much space you can add to the logical volume.

First, you can use lvextend to extend the size of the logical volume, to fill up the remaining space:

sudo lvextend --extents +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv

Now, you can resize the filesystem in that logical volume.

sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv

Finally, you can see the end result:

sudo df -h /