On Wed, May 16, 2018 at 11:33:40PM +0200, Frédéric wrote:
> > What should I do? Just try to reboot another time?
> 
> Ctrl+Alt+Suppr did not work.
> Ctrl+Alt+SysReq works only for key S "Emergency Sync complete". All
> other keys in REISUB give "This sysrq operation is disabled.

I never heard that <ctrl> might be part of the sysrq combo.

Here on an x86 it's 

0: press <alt>, keep holding
1: press <fn>-<print>, release  <fn>-<print>
2: press the magic key, release it
3: release <alt>

But maybe you have most sysrq keys disabled: if you do a 
cat /proc/sys/kernel/sysrq
you might see what currently is set (my guess: 16).

more on the topic:
https://fedoraproject.org/wiki/QA/Sysrq#How_do_I_enable_the_magic_SysRq_key.3F

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/plain/Documentation/sysrq.txt?id=refs/tags/v4.9.5

And careful: hitting 'c' in sysrq will crash your system .. :)

Wolfgang
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