You can zeroise the following way:
- Boot from another drive (not the persistent live drive)
- Mount a partition with a file system (read-write)
- cd to its mountpoint
- Write zeros until the partition is full: sudo dd if=/dev/zero of=BLANK bs=4096
- Delete the file BLANK
- cd from the mountpoint
- Unmount the partition
- Do the same for the next partition ...
This is implemented in mkpersimage and works for me. Maybe something is still missing in your computer for it to work. But you should be able to look at the code and use the method 'manually'.
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