[Bug 1834250] Re: update-grub complains about non-existent drives (due to cardreader)

[Gordon]

Confirmed from comment #11 by mbdev

Adding a global_filter to line 151 just after the default section
corrected the problem.

Before adding the filter to /etc/lvm/lvm.conf I was getting this:

```
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
  /dev/sda: open failed: No medium found
Found linux image: /boot/vmlinuz-5.3.0-46-lowlatency
```

After adding the comment, it seems to be corrected:

```
$ sudo update-grub
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.3.0-46-lowlatency
Found initrd image: /boot/initrd.img-5.3.0-46-lowlatency
Found linux image: /boot/vmlinuz-5.3.0-45-lowlatency
Found initrd image: /boot/initrd.img-5.3.0-45-lowlatency
Found linux image: /boot/vmlinuz-5.3.0-42-lowlatency
Found initrd image: /boot/initrd.img-5.3.0-42-lowlatency
Found Windows Boot Manager on /dev/nvme0n1p1@/EFI/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for EFI firmware configuration
done
```

Wondering if there is any way to detect removable media not connected
which was the source of my issue since my internal drives are NVMe and
do not use SDx, those were USB keys as I recall.

-- 
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https://bugs.launchpad.net/bugs/1834250

Title:
  update-grub complains about non-existent drives (due to cardreader)

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  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)

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