termux in the nethunter app is old and will fail, you need a newer version, fdroid is newest (play store is also outdated)
command you run are same in newer termux, but will complete…
can take a couple of goes to have the download.
once you have the files you’ll need to create a folder to unpack it too, and then later copy it to the correct location. there are posts about this part on the forum about this already