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etc_org/sysctl.d/10-magic-sysrq.conf

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+# The magic SysRq key enables certain keyboard combinations to be
+# interpreted by the kernel to help with debugging. The kernel will respond
+# to these keys regardless of the current running applications.
+#
+# In general, the magic SysRq key is not needed for the average Ubuntu
+# system, and having it enabled by default can lead to security issues on
+# the console such as being able to dump memory or to kill arbitrary
+# processes including the running screen lock.
+#
+# Here is the list of possible values:
+#   0 - disable sysrq completely
+#   1 - enable all functions of sysrq
+#  >1 - enable certain functions by adding up the following values:
+#          2 - enable control of console logging level
+#          4 - enable control of keyboard (SAK, unraw)
+#          8 - enable debugging dumps of processes etc.
+#         16 - enable sync command
+#         32 - enable remount read-only
+#         64 - enable signalling of processes (term, kill, oom-kill)
+#        128 - allow reboot/poweroff
+#        256 - allow nicing of all RT tasks
+#
+#   For example, to enable both control of console logging level and
+#   debugging dumps of processes: kernel.sysrq = 10
+#
+kernel.sysrq = 176