I'm running 19.10 x64 (up to date as of today), LVM setup. Originally
installed 19.04 and upgraded. This affects me too. Or, affected rather,
because after following advice from comment #9 above it seems fixed.
Details follow.
```
$ sudo update-grub2
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
Found linux image: /boot/vmlinuz-5.3.0-29-generic
Found initrd image: /boot/initrd.img-5.3.0-29-generic
Found linux image: /boot/vmlinuz-5.3.0-26-generic
Found initrd image: /boot/initrd.img-5.3.0-26-generic
/dev/sda: open failed: No medium found
/dev/sda: open failed: No medium found
/dev/sda: open failed: No medium found
```
It goes on, but I'm skipping it.
```
$ lsblk
nvme0n1 259:0 0 931.5G 0 disk
├─nvme0n1p1 259:1 0 512M 0 part /boot/efi
├─nvme0n1p2 259:2 0 732M 0 part /boot
└─nvme0n1p3 259:3 0 930.3G 0 part
└─nvme0n1p3_crypt 253:0 0 930.3G 0 crypt
├─ubuntu--vg-root 253:1 0 929.3G 0 lvm /
└─ubuntu--vg-swap_1 253:2 0 976M 0 lvm [SWAP]
```
Above I'm skipping bunch of loop## from output of lsblk.
The Ubuntu "Disks" app identified the /dev/sda as "Generic- SD/MMC". It
seems it's a built-in card reader of my ThinkPad. I decided to follow
comment #9 above to filter out that device from LVM. And, advice from
comment #9 fixed the issue! Thanks a lot Zer00Cool!
What I did exactly is:
1. grep for "global_filter" in lvm.conf - that file is really long...
```
$ grep -Fn "global_filter" /etc/lvm/lvm.conf
142: # Configuration option devices/global_filter.
146: # Use global_filter to hide devices from these LVM system components.
148: # global_filter are not opened by LVM.
150: # global_filter = [ "a|.*/|" ]
```
2. After the commented out "global_filter" setting (line 150 in my
case), I added the following:
```
global_filter = [ "r|/dev/sda|" ]
```
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https://bugs.launchpad.net/bugs/1834250
Title:
update-grub complains about non-existent drives (due to cardreader)
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