The following message about Signal was posted on a thread about configuring Debian minimal templates. Ideally, Signal would be the only thing installed in a minimal template. Less RAM usage, less disk space, fewer unnecessary packages installed=less attack surface etc. But minimal templates require more initial modifications and finessing to get set up properly so you might want to wait until you get more familiar with Qubes before using them. Either way, this might help you get Signal set up in your template.
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