resize and mount LVM volume in Linux

run sudo pvs to get a volume group (column VG) for your device
run sudo lvdisplay ⟨your VG⟩ to get a LV Path.

to extend the lvm volume you can run:
sudo lvextend -l +100FREE /path/to/your/lvmvolume

then extend your fs with:
sudo resize2fs /same/path/to/your/lvmvolume

if you want to mount an lvm volume to check out the fs, you can do so:

run sudo vgchange -a y to activate all groups
now you can mount it: sudo mount ⟨your LV Path⟩ /mnt/somepoint