And here is your problem "The Grand DEB packaging"- thread is for N900 only, if you follow the thread with N9, you will corrupt your tar binary sha1 not to match refhashlist even if your in open mode.

Options:
1. Reflash the device
2. copy origin tar from busybox back in place (worst case still need to reflash)

You really should just do deb packages with your linux desktop and not on device. If you really need to replace tar command, then use AEGIS_FIXED_ORIGIN in openmode, and even then gnutar might be incompatible with harmattan installer.