Fixed it.
Found the solution here: https://bugs.launchpad.net/ubuntu/+s...ux/+bug/642421
Though the description doesn't match exactly with my problem.
To summarize the steps:
1) Edit /etc/initramfs-tools/initramfs.conf (sudo gedit /etc/initramfs-tools/initramfs.conf in the console) and change the line MODULES=most to MODULES=dep.
2) Reinstall initramfs-tools and initramfs-tools-bin
Hope this helps someone else.
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