Missing unix.ko in 4.6 initrd prevents LVM boot

[knz]

Somehow recently the default kernel config for kernel 4.6 was changed from CONFIG_UNIX=y to CONFIG_UNIX=m.

This however prevents systems with full disk encryption to start properly, as the lvm encryption tools require unix sockets during set-up in the initrd.

The proper fix would either be to restore CONFIG_UNIX=y or to force the unix.ko module to always be included (and loaded) in the initrd. The latter is likely to be the better approach, thus filing this against initramfs-tools.

[knz (knz)]

Found in Ubuntu 16.10

[knz (knz)]

Workaround:

add "unix" and "unix_diag" to /etc/initramfs-tools/modules.