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Why are the installation instructions aimed towards Linux?
(sh.itjust.works)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
https://forum.f-droid.org/t/where-is-the-pgp-signature-verification-app/14305/
It mention Termux and OpenKeychain