I used to limit my Ubuntu partition size for many reasons, for example if my HD is 1TB, my Ubuntu partition is about 100G only. But this partition might get full quickly as you can see below I have used 94% of my storage :
$ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/ubuntu--vg-root 84G 75G 5.5G 94% /
To resize this on the fly, let’s add 50G :
$ sudo lvextend -L+50G /dev/ubuntu-vg/root Extending logical volume root to 135.00 GiB Logical volume root successfully resized
That’s it, we just need to tell our filesystem that the volume size changed :
$ sudo resize2fs /dev/ubuntu-vg/root resize2fs 1.42.9 (4-Feb-2014) Filesystem at /dev/ubuntu-vg/root is mounted on /; on-line resizing required old_desc_blocks = 6, new_desc_blocks = 9 The filesystem on /dev/ubuntu-vg/root is now 35389440 blocks long.
Now if we run df again we can see that I have now 53G available but not 55.5G, since before I had 5.5G available. The reason is that I was working in the same time on that partition and used 2.5G in the meantime.
$ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/ubuntu--vg-root 133G 75G 53G 59% /