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I have a ubuntu system as a virtual system on Virtual Box. It uses VHD as its hard disk. I manged to change the size of VHD using VHD resizer, now I want to expand the partition on vhd so it uses the expanded size. How can I do this?

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Expanding a partition and filesystem size is fairly straightforward, but it will need to be done from inside a live environment, unless it's on LVM. LVM supports online resizing of partition.

From inside a live cd, you can uses parted or a parted front-end such as gparted. The partition that you are trying to resize must be at the end of the disk. Here is an example for a single partition setup that spans an entire disk:

parted /dev/sda1 resize 0 -1

Once the partition is extended, you still need to extend the filesystem. If it is ext2/3/4, you can use resize2fs. Here is an example:

resize2fs /dev/sda1

Without any options, resize2fs will extend a filesystem to use all available space on the partition.

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I can not change the size of partion as it says that it is locked. Its type is ext4. what that means? –  user654019 Oct 31 '12 at 16:11
    
@user654019 - Is the VM booted into a liveCD? Are you root? What says it's "locked"? What is the exact error message? –  jordanm Oct 31 '12 at 17:25
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