The bug you're hitting is in Ubuntu, it's nothing to do with VMDK.
Please see:
https://bugs.launchpad.net/ubuntu/+source/supermin/+bug/1743300
https://github.com/libguestfs/supermin/commit/158854e3ba4be7f6b8d81f662dd...
Rich.
--
Richard Jones, Virtualization Group, Red Hat
http://people.redhat.com/~rjones
Read my programming and virtualization blog:
http://rwmj.wordpress.com
libguestfs lets you edit virtual machines. Supports shell scripting,
bindings from many languages.
http://libguestfs.org