Ubuntu expand disk space – Command Line

Warning: Be extremely careful when making changes to partitions and disk as it can lead to broken systems and lost data. Make sure you have a backup.

This scenario is done on a basic Ubuntu install. No fancy LVM stuff going on. If you need that, refer to here

Disk /dev/sda: 64 GiB, 68719476736 bytes, 134217728 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x2062ec28
Device     Boot    Start      End  Sectors  Size Id Type
/dev/sda1  *        2048 65011711 65009664   31G 83 Linux
/dev/sda2       65013758 67106815  2093058 1022M  5 Extended
/dev/sda5       65013760 67106815  2093056 1022M 82 Linux swap / Solaris

From the above output of fdisk -l, we see that the disk has 64GiB available, but the primary partition is only 31G. To make the primary partition larger we need to

  • Run fdisk “fdisk /dev/sda”
  • Delete partitions 2 and 5,
  • Delete Partition 1
  • Create Partition 1 again on the same starting boundary
  • Put the end boundary close to the end so we end up with ~62GiB for that partition
  • Recreate sda2, the 1GiB extended partition
  • Write changes to disk
  • Run resize2fs to resize the filesystem

You may need to boot up in recovery to get this command working. Also if you boot up in recovery, you’ll need to remount the root / partition read/write. More info here.

resize2fs /dev/sda1

Helpful Links

resize2fs: Read-only file system While checking for on-line resizing support

Had a problem with resize2fs not resizing the root partition of Ubuntu. Was giving the following error

resize2fs: Read-only file system While checking for on-line resizing support

The problem is the root partition I was trying to resize was mounted read only. Remounting as read/write fixed the problem

mount -o remount /

Then rerun the resize command to fill up the rest of the free space

resize2fs /dev/sda1