Public bug reported:
apt-cache policy grub2-common
grub2-common:
Installed: 2.02-2ubuntu8
Candidate: 2.02-2ubuntu8
Version table:
*** 2.02-2ubuntu8 500
500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
100 /var/lib/dpkg/status
Setting /etc/default/grub
GRUB_TERMINAL=serial
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no
--stop=1"
is ignored by /usr/sbin/update-grub and /usr/sbin/grub-mkconfig
apparently due to /etc/grub.d/00_header only checking:
for x in ${GRUB_TERMINAL_INPUT} ${GRUB_TERMINAL_OUTPUT}; do
if [ xserial = "x$x" ]; then
serial=1;
and therefore the subsequent generation of the serial command not being
performed:
if [ "x$serial" = x1 ]; then
...
echo "${GRUB_SERIAL_COMMAND}"
and thus resulting in:
$ grep -n terminal /boot/grub/grub.cfg
62:terminal_input console
63:terminal_output console
In order to have it work correctly 2 additional assignments are required:
GRUB_TERMINAL=serial
GRUB_TERMINAL_INPUT=serial
GRUB_TERMINAL_OUTPUT=serial
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no
--stop=1"
GRUB_TERMINAL isn't exported to the scripts in /etc/grub.d/ but is used
by /usr/sbin/grub-mkconfig
Surely when it is set and the others aren't it should be copied to them?
It seems ridiculous to require 3 variables be set when 1 will do for the
default case of having both I/O redirected to a serial port.
As an aside:
Using a cloudimg derived rootfs (used by LXD and others) as the basis
for a bootable image creates a file that isn't attributed to any package
which forces 'console' even when 'serial' is set
/etc/default/grub.d/50-cloudimg-settings.cfg:
GRUB_TERMINAL=console
This file has to be deleted.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1763151
Title:
GRUB_TERMINAL=serial ignored
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