> GPG signing a Debian package does nothing because package signatures are not verified by default on any major distribution when packages are installed with apt-get install
On both Debian 9.4 and Ubuntu 16.04 (what I have handy):
# Do not enable debsig-verify by default; since the distribution is not using
# embedded signatures, debsig-verify would reject all packages.
no-debsig
That's sliiiiiiightly misleading. :/