Ubuntu – Could not unmount /dev/sda1 with root filesystem

diskmount

Could not unmount /dev/sda1 with root filesystem.
When I try to resize it by unmounting but the following error message pops up:

The partition could not be unmounted from the following mount points:

/

Most likely other partitions are also mounted on these mount points. You are advised to unmount them manually.

How to go about?

Best Answer

You can't unmount it, because it's being used. From the error message, /dev/sda1 is the location of your root directory /. Instead, create a gparted live CD, then boot from that. Then, you should be able to resize the (now-unused) root partition.

Make sure you back everything up before resizing!

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