Days ago, I got a dell server, it has 4T spaces, but when I used a tool to migrate a ubuntu operating system to the server, it only used 100G of the disk, today I used some commands to expanded the space.

lsblk // show how much spaces I could use.
lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv // Use all free space in the volume group
resize2fs /dev/ubuntu-vg/ubuntu-lv // Becuase I am using ext4 filesystems, so I use this command to resize the filesystem to utilize the added space.