Ahh, and this is why. I was previously testing with "de_DE", and today tested with "de_DE.UTF-8":
(xenial-amd64)root@nosferatu:~# dpkg -l libc6 | grep ^i ii libc6:amd64 2.23-0ubuntu3 amd64 GNU C Library: Shared libraries (xenial-amd64)root@nosferatu:~# mkinitramfs --help /usr/sbin/mkinitramfs: unrecognized option '--help' W: non-GNU getopt (xenial-amd64)root@nosferatu:~# LANG=de_DE mkinitramfs --help Segmentation fault (core dumped) W: non-GNU getopt (xenial-amd64)root@nosferatu:~# LANG=de_DE.UTF-8 mkinitramfs --help Segmentation fault (core dumped) W: non-GNU getopt (xenial-amd64)root@nosferatu:~# apt-get update && apt-get install libc6 [...] (xenial-amd64)root@nosferatu:~# dpkg -l libc6 | grep ^i ii libc6:amd64 2.23-0ubuntu4 amd64 GNU C Library: Shared libraries (xenial-amd64)root@nosferatu:~# mkinitramfs --help /usr/sbin/mkinitramfs: unrecognized option '--help' W: non-GNU getopt (xenial-amd64)root@nosferatu:~# LANG=de_DE mkinitramfs --help /usr/sbin/mkinitramfs: unrecognized option '--help' W: non-GNU getopt (xenial-amd64)root@nosferatu:~# LANG=de_DE.UTF-8 mkinitramfs --help Segmentation fault (core dumped) W: non-GNU getopt
Ahh, and this is why. I was previously testing with "de_DE", and today tested with "de_DE.UTF-8":
(xenial- amd64)root@ nosferatu: ~# dpkg -l libc6 | grep ^i amd64)root@ nosferatu: ~# mkinitramfs --help mkinitramfs: unrecognized option '--help' amd64)root@ nosferatu: ~# LANG=de_DE mkinitramfs --help amd64)root@ nosferatu: ~# LANG=de_DE.UTF-8 mkinitramfs --help amd64)root@ nosferatu: ~# apt-get update && apt-get install libc6 amd64)root@ nosferatu: ~# dpkg -l libc6 | grep ^i amd64)root@ nosferatu: ~# mkinitramfs --help mkinitramfs: unrecognized option '--help' amd64)root@ nosferatu: ~# LANG=de_DE mkinitramfs --help mkinitramfs: unrecognized option '--help' amd64)root@ nosferatu: ~# LANG=de_DE.UTF-8 mkinitramfs --help
ii libc6:amd64 2.23-0ubuntu3 amd64 GNU C Library: Shared libraries
(xenial-
/usr/sbin/
W: non-GNU getopt
(xenial-
Segmentation fault (core dumped)
W: non-GNU getopt
(xenial-
Segmentation fault (core dumped)
W: non-GNU getopt
(xenial-
[...]
(xenial-
ii libc6:amd64 2.23-0ubuntu4 amd64 GNU C Library: Shared libraries
(xenial-
/usr/sbin/
W: non-GNU getopt
(xenial-
/usr/sbin/
W: non-GNU getopt
(xenial-
Segmentation fault (core dumped)
W: non-GNU getopt