It looks like you expanded the VMware virtual disk at the Windows host but the Ubuntu guest OS partition size remained the same; so as far as the guest OS is concerned it is still low on space.
You can use a tool like gparted to expand the guest OS partition. There is gparted from the Ubuntu LiveCD ISO or download from gparted.org the gparted ISO file. So boot up the VM using either ISO and use gparted to expand as needed.
