My PPA setup is causing DEPRECATION Warning:
W: http://ppa.launchpad.net/myid/ppa/ubuntu/dists/focal/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
and
I know superficially it can be fixed with apt-key deprecation warning when updating system
But my question is how to setup my PPA source so that it is not causing such DEPRECATION Warning in the first place.
The answer in apt-key deprecation warning when updating system still uses apt-key:
sudo apt-key export 91E7EE5E | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/team-xbmc.gpg
which gives the Warning of:
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
How can I prepare my PPA repo keys directly from a keyserver instead going through apt-key?
I tried
gpg --keyserver keyserver.ubuntu.com --recv-keys 91E7EE5E --dearmour -o /tmp/ppa.gpg
But it only imported to my own ~/.gnupg/pubring.kbx file, instead of writing to /tmp/ppa.gpg.
gpg --export --keyserver keyserver.ubuntu.com --recv-keys 91E7EE5E | sudo gpg --dearmour -o /tmp/ppa.gpg
is not doing what I want either.
And finally, how can I verify the final /tmp/ppa.gpg file, hopefully to get an output just like:
pub rsa4096 2017-05-08 [SCEA]
1EDD E2CD FC02 5D17 F6DA 9EC0 ADAE 6AD2 8A8F 901A
uid [ unknown] Sublime HQ Pty Ltd <support@sublimetext.com>
sub rsa4096 2017-05-08 [S]
