Public bug reported:

I have this line in /etc/sysrq.d/10-magic-sysrq.conf:

kernel.sysrq = 1 #176

This has worked in Ubuntu 14.04.

Although there are errors and warnings, the setting seems to be applied
on boot.

niklas@panzersperre~> systemctl status systemd-sysctl.service
● systemd-sysctl.service - Apply Kernel Variables
   Loaded: loaded (/lib/systemd/system/systemd-sysctl.service; static; vendor 
preset: enabled)
   Active: failed (Result: exit-code) since Di 2016-12-27 18:31:50 CET; 16h ago
     Docs: man:systemd-sysctl.service(8)
           man:sysctl.d(5)
  Process: 770 ExecStart=/lib/systemd/systemd-sysctl (code=exited, 
status=1/FAILURE)
 Main PID: 770 (code=exited, status=1/FAILURE)

Dez 27 18:31:50 panzersperre systemd[1]: Starting Apply Kernel Variables...
Dez 27 18:31:50 panzersperre systemd[1]: systemd-sysctl.service: Main process 
exited, code=exited, stat
Dez 27 18:31:50 panzersperre systemd[1]: Failed to start Apply Kernel Variables.
Dez 27 18:31:50 panzersperre systemd[1]: systemd-sysctl.service: Unit entered 
failed state.
Dez 27 18:31:50 panzersperre systemd[1]: systemd-sysctl.service: Failed with 
result 'exit-code'.

niklas@panzersperre~> sudo /lib/systemd/systemd-sysctl
Couldn't write '1 #176' to 'kernel/sysrq', ignoring: Invalid argument

niklas@panzersperre~> sysctl kernel.sysrq
kernel.sysrq = 1

niklas@panzersperre~> lsb_release -rd
Description:    Ubuntu 16.04.1 LTS
Release:        16.04

niklas@panzersperre~> env LANG=C apt-cache policy systemd
systemd:
  Installed: 229-4ubuntu13
  Candidate: 229-4ubuntu13
  Version table:
 *** 229-4ubuntu13 500
        500 http://de.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     229-4ubuntu10 500
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
     229-4ubuntu4 500
        500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

niklas@panzersperre~> /lib/systemd/systemd-sysctl --version
systemd 229
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP 
+GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1652918

Title:
  systemd-sysctl crashes when there's a comment at the end of a line

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