I can't seem to figure out how to enable or disable kernel crash dump.
Edit:
root@virtual-VirtualBox:~# sudo apt install linux-crashdump Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: crash kdump-tools kexec-tools libdw1 libelf1 makedumpfile The following NEW packages will be installed: crash kdump-tools kexec-tools libdw1 linux-crashdump makedumpfile The following packages will be upgraded: libelf1 1 upgraded, 6 newly installed, 0 to remove and 378 not upgraded. Need to get 3,175 kB of archives. After this operation, 9,731 kB of additional disk space will be used. Do you want to continue? [Y/n] Y Get:1 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libelf1 amd64 0.165-3ubuntu1.2 [43.5 kB] Get:2 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 crash amd64 7.2.3+real-1~16.04.1 [2,680 kB] Get:3 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 kexec-tools amd64 1:2.0.16-1ubuntu1~16.04.1 [77.4 kB] Get:4 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libdw1 amd64 0.165-3ubuntu1.2 [192 kB] Get:5 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 makedumpfile amd64 1:1.6.3-2~16.04.3 [156 kB] Get:6 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 kdump-tools amd64 1:1.6.3-2~16.04.3 [23.3 kB] Get:7 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 linux-crashdump amd64 4.4.0.184.190 [2,606 B] Fetched 3,175 kB in 1s (2,116 kB/s) Preconfiguring packages ... (Reading database ... 183573 files and directories currently installed.) Preparing to unpack .../libelf1_0.165-3ubuntu1.2_amd64.deb ... Unpacking libelf1:amd64 (0.165-3ubuntu1.2) over (0.165-3ubuntu1.1) ... Selecting previously unselected package crash. Preparing to unpack .../crash_7.2.3+real-1~16.04.1_amd64.deb ... Unpacking crash (7.2.3+real-1~16.04.1) ... Selecting previously unselected package kexec-tools. Preparing to unpack .../kexec-tools_1%3a2.0.16-1ubuntu1~16.04.1_amd64.deb ... Unpacking kexec-tools (1:2.0.16-1ubuntu1~16.04.1) ... Selecting previously unselected package libdw1:amd64. Preparing to unpack .../libdw1_0.165-3ubuntu1.2_amd64.deb ... Unpacking libdw1:amd64 (0.165-3ubuntu1.2) ... Selecting previously unselected package makedumpfile. Preparing to unpack .../makedumpfile_1%3a1.6.3-2~16.04.3_amd64.deb ... Unpacking makedumpfile (1:1.6.3-2~16.04.3) ... Selecting previously unselected package kdump-tools. Preparing to unpack .../kdump-tools_1%3a1.6.3-2~16.04.3_amd64.deb ... Unpacking kdump-tools (1:1.6.3-2~16.04.3) ... Selecting previously unselected package linux-crashdump. Preparing to unpack .../linux-crashdump_4.4.0.184.190_amd64.deb ... Unpacking linux-crashdump (4.4.0.184.190) ... Processing triggers for libc-bin (2.23-0ubuntu11) ... Processing triggers for man-db (2.7.5-1) ... Processing triggers for systemd (229-4ubuntu21.16) ... Processing triggers for ureadahead (0.100.0-19) ... Setting up libelf1:amd64 (0.165-3ubuntu1.2) ... Setting up crash (7.2.3+real-1~16.04.1) ... Setting up kexec-tools (1:2.0.16-1ubuntu1~16.04.1) ... Generating /etc/default/kexec... Setting up libdw1:amd64 (0.165-3ubuntu1.2) ... Setting up makedumpfile (1:1.6.3-2~16.04.3) ... Setting up kdump-tools (1:1.6.3-2~16.04.3) ... Creating config file /etc/default/kdump-tools with new version Generating grub configuration file ... Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported. Found linux image: /boot/vmlinuz-4.15.0-45-generic Found initrd image: /boot/initrd.img-4.15.0-45-generic Found memtest86+ image: /boot/memtest86+.elf Found memtest86+ image: /boot/memtest86+.bin done kdump-tools-dump.service is a disabled or a static unit, not starting it. Setting up linux-crashdump (4.4.0.184.190) ... Processing triggers for libc-bin (2.23-0ubuntu11) ... Processing triggers for systemd (229-4ubuntu21.16) ... Processing triggers for ureadahead (0.100.0-19) ... root@virtual-VirtualBox:~# dpkg-reconfigure kexec-tools root@virtual-VirtualBox:~# dpkg-reconfigure kdump-tools Generating grub configuration file ... Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported. Found linux image: /boot/vmlinuz-4.15.0-45-generic Found initrd image: /boot/initrd.img-4.15.0-45-generic Found memtest86+ image: /boot/memtest86+.elf Found memtest86+ image: /boot/memtest86+.bin done kdump-tools-dump.service is a disabled or a static unit, not starting it.
sudo apt install linux-crashdump" -- have you done that?kdump.service?