This was fixed at least in 16.10 (and likely in 16.04 as well). (kexec-tools no longer makes the change by default).
** Changed in: kexec-tools (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to kexec-tools in Ubuntu. https://bugs.launchpad.net/bugs/1311834 Title: adds crashkernel line during install, but doesn't remove it when it's purged Status in kexec-tools package in Ubuntu: Fix Released Bug description: 1) Ubuntu 14.04. 2) kexec-tools (1:2.0.6-0ubuntu2) 3) I expect that when removing kexec-tools it removed the crashkernel line that it added 4) It doesn't get removed (tried both remove and purge)because kexec-tools doesn't call update-grub A workaround is just to manually do an update-grub. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kexec-tools/+bug/1311834/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp