Comment 0 for bug 1834250

sudo update-grub

Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
Found linux image: /boot/vmlinuz-5.0.0-17-generic
Found initrd image: /boot/initrd.img-5.0.0-17-generic
Found linux image: /boot/vmlinuz-5.0.0-16-generic
Found initrd image: /boot/initrd.img-5.0.0-16-generic
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
  /dev/sdc: open failed: No medium found
  /dev/sdd: open failed: No medium found
  /dev/sde: open failed: No medium found
  /dev/sdf: open failed: No medium found
Adding boot menu entry for EFI firmware configuration
done

--

lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 3.7T 0 disk
├─sda1 8:1 0 512M 0 part /boot/efi
├─sda2 8:2 0 732M 0 part /boot
└─sda3 8:3 0 3.7T 0 part
  └─sda3_crypt 253:0 0 3.7T 0 crypt
    ├─kubuntu--vg-swap_1 253:1 0 976M 0 lvm [SWAP]
    └─kubuntu--vg-root 253:2 0 3.7T 0 lvm /
sdb 8:16 0 3.7T 0 disk
└─sdb1 8:17 0 3.7T 0 part
sdg 8:96 0 7.3T 0 disk
└─sdg1 8:97 0 7.3T 0 part /media/scott/8TB Ext Drive
sr0 11:0 1 15.7G 0 rom

--

cat /etc/default/grub

GRUB_DEFAULT=0
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="intel_iommu=on"
GRUB_CMDLINE_LINUX=""

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: grub2-common 2.02+dfsg1-12ubuntu3
ProcVersionSignature: Ubuntu 5.0.0-17.18-generic 5.0.8
Uname: Linux 5.0.0-17-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu3
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Jun 25 15:05:29 2019
InstallationDate: Installed on 2019-06-14 (10 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190614)
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)