ubuntu-keyring imports the Ubuntu CD Signing Key as a key trusted by apt

[Philipp Kern]

Please take this with a grain of salt as I'm not reporting it with a clean trusty install at my fingertips.

ubuntu-keyring ships a /usr/share/keyrings/ubuntu-archive-keyring.gpg file that contains the Ubuntu CD Signing Keys (old and new):

 % gpg /usr/share/keyrings/ubuntu-archive-keyring.gpg
pub 1024D/437D05B5 2004-09-12 Ubuntu Archive Automatic Signing Key <email address hidden>
sub 2048g/79164387 2004-09-12
pub 1024D/FBB75451 2004-12-30 Ubuntu CD Image Automatic Signing Key <email address hidden>
pub 4096R/C0B21F32 2012-05-11 Ubuntu Archive Automatic Signing Key (2012) <email address hidden>
pub 4096R/EFE21092 2012-05-11 Ubuntu CD Image Automatic Signing Key (2012) <email address hidden>

They end up being trusted by apt because the keyring is taken as the initial trusted key set in /etc/apt/trusted.gpg. This is most likely not what we want.

[Dimitri John Ledkov (xnox)]

This is correct and intended behavior I believe.

By default, packages archives shipped on the ISO images are signed with the cdimage key, and are trusted.

This means one can perform [dist-]upgrades from installation ISOs (note these are no longer produced by default).

And enabled one to install packages from the ISOs (e.g. install updated openssl on a 14.04.0 host from the 14.04.1 server iso; another example install optional drivers off the desktop iso).

[Launchpad Janitor (janitor)]

[Expired for ubuntu-keyring (Ubuntu) because there has been no activity for 60 days.]