abnt2 layout keyboard not found, unable to upgrade initramfs-tools

In a recently fresh installed Ubuntu 14.04 Server I did an aptitude full-upgrade and I get the following error:

root@indus:/tmp# aptitude full-upgrade
The following partially installed packages will be configured:
  initramfs-tools
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.
Setting up initramfs-tools (0.103ubuntu4.2) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.103ubuntu4.2) ...
update-initramfs: Generating /boot/initrd.img-3.13.0-32-generic
/usr/share/initramfs-tools/hooks/console_setup: 8: /etc/default/keyboard: abnt2: not found
E: /usr/share/initramfs-tools/hooks/console_setup failed with return 127.
update-initramfs: failed for /boot/initrd.img-3.13.0-32-generic with 127.
dpkg: error processing package initramfs-tools (--configure):
 subprocess installed post-installation script returned error exit status 127
Errors were encountered while processing:
 initramfs-tools
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install. Trying to recover:
Setting up initramfs-tools (0.103ubuntu4.2) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.103ubuntu4.2) ...
update-initramfs: Generating /boot/initrd.img-3.13.0-32-generic
/usr/share/initramfs-tools/hooks/console_setup: 8: /etc/default/keyboard: abnt2: not found
E: /usr/share/initramfs-tools/hooks/console_setup failed with return 127.
update-initramfs: failed for /boot/initrd.img-3.13.0-32-generic with 127.
dpkg: error processing package initramfs-tools (--configure):
 subprocess installed post-installation script returned error exit status 127
Errors were encountered while processing:
 initramfs-tools

root@indus:/tmp#

This is blocking me from upgrading the package initramfs-tools to the latest version. Because I live in Brazil, the layout abnt2 is the correct one for this Ubuntu Server (no Xorg installed) and it was properly selected during install. But in the full-upgade this started to happen unexpectly. I never changed the keyboard settings or messed with it.