Key is stored in legacy trusted.gpg keyring

[cerebrux]

New versions of Ubuntu and Debian >12 are reporting the following Warning:

W: http://ppa.launchpad.net/utappia/stable/ubuntu/dists/***/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.

when installing ucaresystem that adds the repository.

Also in some distributions I get some warnings like :

Warning: The postinst maintainerscript of the package ucaresystem-core
Warning: seems to use apt-key (provided by apt) without depending on gpg, gnupg, or gnupg2.
Warning: This will BREAK in the future and should be fixed by the package maintainer(s).
Note: Check first if apt-key functionality is needed at all - it probably isn't!
Warning: apt-key should not be used in scripts (called from postinst maintainerscript of the package ucaresystem-core)
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).

These are just some warnings but I should address them in the near future.