This tutorial is for when your physical disk is large (e.g. 1 TB), but the operating system only recognizes a part (e.g. 100 GB) due to the default LVM configuration in Ubuntu.
To ensure that your system uses LVM and confirm where the free space is, run:
Bash
lsblk
Your goal is to identify the name of the logical volume that is mounted at the root (/). By default, it usually is /dev/mapper/ubuntu--vg-ubuntu--lv.
Run the following two commands in the terminal. No require rebooting nor cause data loss.
Bash
sudo lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
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Note: If the disk volume of your machine changes in the future, simply replace /dev/mapper/ubuntu--vg-ubuntu--lv with the correct path.
Bash
sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
Step 3: Confirm the changes
To verify that the operating system now has access to all the Terabyte, execute:
Bash
df -h /
In the “Size” column, you should see reflected the new total available space (approximately 920-930 GB usable after format discounts).
