I saw both of these in the apt sources. Since this is a secure communications app, what is the correct source to use for Ubuntu? Searching for Signal, I see:
And lower:
With these details:
Before thinking this is an unnecessary abundance of caution, you can see there is an effort to create frauds out there:
- Authoritative: https://github.com/signalapp
- vs. presumably fake/nefarious: https://github.com/whispersystems
Please don't mark this as a duplicate unless you can guarantee these two applications are identical except for being a snap versus a source. If you can demonstrate they're identical, then submit that as an answer. This is a question not because the asker doesn't know what a snap is, but in order to disambiguate and provide authority for this security conscious application.