I need to get a crash dump of my linux kernel.

I am going to describe the scenario:

  1. Hardware: Notebook Dell E5450.
  2. Linux Distribution: Linux Mint 18.3 (Ubuntu 16.04).
  3. SysRq: enabled by /etc/sysctl.d/10-magic-sysrq.conf.
  4. Installed packages: linux-crashdump.
  5. Grub2: added "crashkernel=384M-2G:64M,2G-:128M"
  6. Kdump check: "kdump-config show" reports a working configuration.
  7. File system: folder "/var/crash" exists.

When I press "Alt+PrnScr+C" the system freezes without reboot and does not save any dump into /var/crash. Same thing sending "echo c | sudo tee /proc/sysrq-trigger".

How could I fix this situation?

Thank you so much!

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