Public bug reported:

Ubuntu 13.10
apt  0.9.9.1~ubuntu3

'apt-get update' has started showing several warnings like the
following, even though the keys are present:

W: GPG error: http://us.archive.ubuntu.com saucy Release: The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

'apt-key list' shows the keys in question in its output...

pub   1024D/437D05B5 2004-09-12
uid                  Ubuntu Archive Automatic Signing Key <ftpmas...@ubuntu.com>
sub   2048g/79164387 2004-09-12

pub   4096R/C0B21F32 2012-05-11
uid                  Ubuntu Archive Automatic Signing Key (2012) 
<ftpmas...@ubuntu.com>

...and its output begins with the following:

gpg: keyblock resource `/etc/apt/trusted.gpg.d//webupd8team-y-ppa-
manager.gpg': resource limit

I see the same gpg message when I manually update/remove/add the keys in
question. E.g.:

$ sudo apt-key update
gpg: keyblock resource `/etc/apt/trusted.gpg.d//webupd8team-java.gpg': resource 
limit
gpg: keyblock resource `/etc/apt/trusted.gpg.d//webupd8team-y-ppa-manager.gpg': 
resource limit
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key 
<ftpmas...@ubuntu.com>" not changed
gpg: key FBB75451: "Ubuntu CD Image Automatic Signing Key <cdim...@ubuntu.com>" 
not changed
gpg: key C0B21F32: "Ubuntu Archive Automatic Signing Key (2012) 
<ftpmas...@ubuntu.com>" not changed
gpg: key EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) 
<cdim...@ubuntu.com>" not changed
gpg: Total number processed: 4
gpg:              unchanged: 4

I asked about the "resource limit" message on the gnupg-users mailing list...
http://www.mail-archive.com/gnupg-users@gnupg.org/msg23300.html
Based on Werner Koch's (the dev) answer...
http://www.mail-archive.com/gnupg-users@gnupg.org/msg23302.html
...the secure apt related programs might be making gpg use more than the 
maximum number of keyrings that it can handle.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apt gnupg secure-apt

** Summary changed:

- Apt-get reports NO_PUBKEY gpg error for key that are present in trusted.gpg.
+ Apt-get reports NO_PUBKEY gpg error for keys that are present in trusted.gpg.

** Tags added: gnupg

** Tags added: apt secure-apt

** Description changed:

  Ubuntu 13.10
  apt  0.9.9.1~ubuntu3
  
  'apt-get update' has started showing several warnings like the
  following, even though the keys are present:
  
  W: GPG error: http://us.archive.ubuntu.com saucy Release: The following
  signatures couldn't be verified because the public key is not available:
  NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
  
  'apt-key list' shows the keys in question in its output...
  
  pub   1024D/437D05B5 2004-09-12
  uid                  Ubuntu Archive Automatic Signing Key 
<ftpmas...@ubuntu.com>
  sub   2048g/79164387 2004-09-12
  
  pub   4096R/C0B21F32 2012-05-11
  uid                  Ubuntu Archive Automatic Signing Key (2012) 
<ftpmas...@ubuntu.com>
  
  ...and its output begins with the following:
  
  gpg: keyblock resource `/etc/apt/trusted.gpg.d//webupd8team-y-ppa-
  manager.gpg': resource limit
  
- I see the same gpg message when I manually updated/removed/added the
- keys in question. E.g.:
+ I see the same gpg message when I manually update/remove/add the keys in
+ question. E.g.:
  
  $ sudo apt-key update
  gpg: keyblock resource `/etc/apt/trusted.gpg.d//webupd8team-java.gpg': 
resource limit
  gpg: keyblock resource 
`/etc/apt/trusted.gpg.d//webupd8team-y-ppa-manager.gpg': resource limit
  gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key 
<ftpmas...@ubuntu.com>" not changed
  gpg: key FBB75451: "Ubuntu CD Image Automatic Signing Key 
<cdim...@ubuntu.com>" not changed
  gpg: key C0B21F32: "Ubuntu Archive Automatic Signing Key (2012) 
<ftpmas...@ubuntu.com>" not changed
  gpg: key EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) 
<cdim...@ubuntu.com>" not changed
  gpg: Total number processed: 4
  gpg:              unchanged: 4
  
  I asked about the "resource limit" message on the gnupg-users mailing list...
  http://www.mail-archive.com/gnupg-users@gnupg.org/msg23300.html
  Based on Werner Koch's (the dev) answer...
  http://www.mail-archive.com/gnupg-users@gnupg.org/msg23302.html
  ...the secure apt related programs might be making gpg use more than the 
maximum number of keyrings that it can handle.

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https://bugs.launchpad.net/bugs/1263540

Title:
  Apt-get reports NO_PUBKEY gpg error for keys that are present in
  trusted.gpg.

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