Default grub config gives warnings

[anatoly techtonik]

Grub updates always produce this warning:

Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.

And that comes from default grub config file:

$ diff -u3 /etc/default/grub /usr/share/grub/default/grub
$ cat /usr/share/grub/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
...

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: grub2-common 2.02~beta3-4ubuntu7.1
ProcVersionSignature: Ubuntu 4.13.0-30.33-generic 4.13.13
Uname: Linux 4.13.0-30-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: i3
Date: Wed Jan 24 23:12:18 2018
SourcePackage: grub2
UpgradeStatus: Upgraded to artful on 2017-10-20 (96 days ago)

[Mathieu Trudel-Lapierre (cyphermox)]

We fixed this recently; this is effectively a duplicate of bug 1258597.