Installing Kali using unman template

1. The problem I’m having:

I’m attempting to install a Kali template that will be regularly updated from a repo so I don’t have to completely rebuild a template from scratch every few weeks/months. Currently I’m (clearly unsuccessfully) following unman’s guide.

2. Error messages:

3. Qubes version:

Qubes release 4.1.2
6.1.62-1.qubes.fc32.x86_64

4. Steps I’ve taken:

1.

In an app qube with internet access I opened terminal & ran

gpg --keyserver keyserver.ubuntu.com --recv-keys 8b3f30f9c8c0c2ef

8b3f30f9c8c0c2ef being the uid unman provides in his guide.
This creates the file /home/user/.gnupg/pubring.kbx

2.

The next step unman has in his guide is

Once you have copies of the key, check the fingerprint:

gpg -n --import --import-options import-show unman.pub

replacing unman.pub with the path to the key.

However, when I run

gpg -n --import --import-options import-show /home/user/.gnupg/pubring.kbx

I get this output:

gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

Conclusion:

I’m not sure what I’m doing wrong, or if there’s another method to get a Kali Qube up & running with less hassle.