I have Ubuntu 12.04 running on VirtualBox 4.2.4 in a Dynamic VDI disk with the limit set to 8gb on a real ext4 partition with more than 40gb of empty room available. However, the VDI it does not expand to the limit. 8gb is more than enough for what I want to do.
How do I make the rest of the space available? Available space in / and .home is 41kb.