Public bug reported:

When multiple unix-char or unix-block devices are attached to container
and detached from system it's not possible to remove that missing
devices from container.

Steps to reproduce:
1) plug two usb drive to system (in my case sda, sdb)
2) create container: lxc launch ubuntu: test
3) attach devices:
lxc config device add test sdb unix-block path=/dev/sdb
lxc config device add test sdc unix-block path=/dev/sdc
4) stop the container: lxc stop test
5) try to start container
6) try to remove sdb and sdc device

Current results:
$ lxc start test
error: Missing source '/dev/sdb' for device 'sdb'
Try `lxc info --show-log test` for more info
$ lxc config device remove test sdb
error: The device path doesn't exist on the host and major/minor wasn't 
specified.
$ lxc config device list test
sdb: unix-block
sdc: unix-block

** Affects: lxd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1690299

Title:
  Cannot remove detached devices from container

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