... In the gmail web UI,
you click on the three dots and then move your cursor to the position
where you want to start writing (I actually forgot to add this to the
previous email...).
These look correct. Just to clarify: Running file shows you "GPG key
public ring" for each file?
What about /etc/apt/trusted.gpg
What you can do is manually run apt-key verify for an InRelease file, e.g.:
/usr/bin/apt-key verify
/var/lib/apt/lists/deb.debian.org_debian_dists_unstable_ InRelease
/usr/bin/apt-key verify
/var/lib/apt/lists/dl.google.com_linux_chrome_deb_dists_ stable_Release{.gpg,}
(showing the two different invocations). If you don't have InRelease
(or Release.gpg and Release) files, you could download one manually.
This should error messages from gpgv.