That's 12 years old, your lordship.
Nowadays you can install Nautilus from Terminal or from Synaptic Package Manager, and once installed, from either you can install
nautilus-wipe
Restart your Nautilus if it is open, and then -right-click your file or folder and choose
wipe
BUT
And we all know Wizard's butt is seldom far behind him.
1. If you install Nautilus, do not wipe your Nemo, you will brick your desktop.
2. There is an easy method for both Nemo in Cinnamon and Caja in MATE
It involves just adding a PPA, as follows
Code:
sudo add-apt-repository ppa:kelebek333/tools
sudo apt update
sudo apt install nemo-wipe
Restart your
NEMO if it is open, and then -right-click your file or folder and choose
wipe
Incidentally, MATE users can do the same with that PPA, and just install caja-wipe for its FM (file manager).
Wiz
IMPORTANT - Make sure you take a Timeshift snapshot before adding PPAs (personal package archives), and your choice before wiping files and folders. And use the Comments field to identify what you are doing for easy recognition later.