You need to understand the difference between a partition and logical volume. You are trying to mount a /dev/sda3 partition but there you already have LVM managing it (show as type `lvm`). This part └─new_name-ubuntu--lv 253:0 0 100G 0 lvm /media/drive / Shows that you have logical volume already mounted to `/media/drive` and as `/` at the same time. That is probably a glitch. There are 3 commands useful when managing LVM - `pvdisplay` - shows Physical volume - `vgdisplay` - shows Volume group - `lvdisplay` - shows Logcial volume In your case your physical volume is `new_name-ubuntu--lv...`. The logical volume `/dev/mapper/ubuntu--vg-ubuntu--lv...`. Anyways to extend LVM you need to do the following -------------------------------------------------- a) Find out which filesystem you have with `lsblk --fs` NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINTS nvme0n1 ├─nvme0n1p1 vfat FAT32 9DE1-20E0 505.1M 1% /boot/efi ├─nvme0n1p2 ext2 1.0 dfxxxx33f-dcde-4884-a09a-68ad7ff0029b 230.6M 46% /boot └─nvme0n1p3 crypto_LUKS 2 db0sxsxe8-a3fb-4570-bea1-3f1fb93407e4 └─nvme0n1p3_crypt LVM2_member LVM2 001 izpVno-gxxl-7ur7-O60V-I5a7-5hdt-INEmmE ├─magnetron--vg-root ext4 1.0 c49xxx2d-4219-4d38-afca-5a517b121b25 83G 30% / ├─magnetron--vg-swap swap 1 46fxxxxc-2a5c-437e-8df4-3ab122beb148 [SWAP] └─magnetron--vg-home ext4 1.0 67xxxxba-ee76-4583-ad24-95517e015788 383.5G 69% /home As you can see I have ext4 for my `root` and `home`. I don't know what type of filesystem you have, I'm using my ext4 as an example. b) Check the free space for your volume group. You can use a shortcut `vgs` Which should show you something along these lines: VG #PV #LV #SN Attr VSize VFree magnetron-vg 1 3 0 wz--n- <1.82t 257.02g As you can see I have 257.02G of free space. c) Check the sizes of logical volume(s) you have with `lvs`: LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert home magnetron-vg -wi-ao---- <1.44t root magnetron-vg -wi-ao---- <127.94g swap magnetron-vg -wi-ao---- 6.00g Now I know how much free space I have left and current sizes of the logical volumes. d) To extend it you need to extend the logical volume. For my home it would be (you will find it at LV path when running `lvdisplay`). To take all available space you need to run: lvextend -l +100%FREE /dev/magnetron-vg/home e) Then you need to extend your filesystem. In my case ext4. **Warning:** be sure your kernel and filesystem support online resizing when mounted - `tune2fs -l /dev/magnetron-vg/home| grep resize_inode` (if you get output it means your filesystem supports online resizing) To resize ext4: resize2fs /dev/magnetron-vg/home To check everything went well: e2fsck /dev/magnetron-vg/home *Note:* You could do the lvm extension and ext4 resize in one command like `lvresize --resizefs --size +100%FREE /dev/magnetron-vg/home`, but I don't like that. I like to have as simple steps as possible. In case anything goes south you know exactly where it went wrong.