Package: kexec-tools Version: 1:2.0.16-1 Tags: patch Ubuntu has aparently been carrying the attached fix for nearly a decade:
kexec-tools (1:2.0.3-2ubuntu2) saucy; urgency=low * Re-fix to not call db_stop from the postinst. [...] kexec-tools (1:2.0.1-1ubuntu2) lucid; urgency=low * Don't call db_stop in the postinst; this is not what it's for, and it causes update-grub to break on Ubuntu by killing the frontend that child processes expect to talk to. LP: #518853. [...] kexec-tools (20090000-2.0.0ubuntu11) karmic; urgency=low * Don't call db_stop in postinst as update-grub calls into debconf; thanks Colin Watson; LP: #400397.
--- kexec-tools-2.0.16/debian/kexec-tools.postinst.orig 2018-02-23 12:36:37.780348638 -0700 +++ kexec-tools-2.0.16/debian/kexec-tools.postinst 2018-02-23 12:36:41.608350514 -0700 @@ -127,7 +127,6 @@ else db_set kexec-tools/use_grub_config "false" fi update_param USE_GRUB_CONFIG -db_stop # ------------------------- Debconf questions end ---------------------