[...]
(Reading database ... 285438 files and directories currently installed.)
Preparing to unpack .../ubuntu-keyring_2012.05.19_all.deb ...
Unpacking ubuntu-keyring (2012.05.19) over (2012.05.19) ...
Setting up ubuntu-keyring (2012.05.19) ...
gpg: keyblock resource `/etc/apt/trusted.gpg.d/webupd8team-sublime-text-3.gpg': resource limit
gpg: keyblock resource `/etc/apt/trusted.gpg.d/webupd8team-tor-browser.gpg': resource limit
gpg: keyblock resource `/etc/apt/trusted.gpg.d/webupd8team-umplayer.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 <ftpmaster@ubuntu.com>" not changed
gpg: key FBB75451: "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>" not changed
gpg: key C0B21F32: "Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>" not changed
gpg: key EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>" not changed
gpg: Total number processed: 4
gpg:              unchanged: 4
dpkg: error processing package ubuntu-keyring (--configure):
 subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
 ubuntu-keyring
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
Setting up ubuntu-keyring (2012.05.19) ...
gpg: keyblock resource `/etc/apt/trusted.gpg.d/webupd8team-sublime-text-3.gpg': resource limit
gpg: keyblock resource `/etc/apt/trusted.gpg.d/webupd8team-tor-browser.gpg': resource limit
gpg: keyblock resource `/etc/apt/trusted.gpg.d/webupd8team-umplayer.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 <ftpmaster@ubuntu.com>" not changed
gpg: key FBB75451: "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>" not changed
gpg: key C0B21F32: "Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>" not changed
gpg: key EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>" not changed
gpg: Total number processed: 4
gpg:              unchanged: 4
dpkg: error processing package ubuntu-keyring (--configure):
 subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
 ubuntu-keyring
>