Templates don’t have normal network access by default:
You can use proxy in the template to access the network e.g. use this command in the template’s terminal:
sudo curl --proxy http://127.0.0.1:8082 -fsSLo /usr/share/keyrings/brave-browser-archive-keyring.gpg https://brave-browser-apt-release.s3.brave.com/brave-browser-archive-keyring.gpg
Also note that Whonix 16 is EOL and no longer supported, install and use Whonix 17 templates using Qubes Template Manager instead.
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