Hi, I had the same problem with a K800 Keyboard from Logitech.
a better way would be to edit the file /etc/initramfs-tools/modules and add hid-logitech-hidpp there. Then it is sufficiant to to sudo update-initramfs -c -k $(uname -r) for the running kernel (or "-k all" for all kernels). Confirmed with Logitech K800, Ubuntu 14.04.3, 3.19.0-26-generic (64bit) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448519 Title: Logitech K400 cannot type in LUKS passphrase at boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1448519/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs