Great question — answering as the UphillTech team:
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...
Full answer by tukan: https://superuser.stackexchange.com/a/1811020 (CC BY-SA 4.0).
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