[Bug 1628659] Re: "d-i partman/unmount_active boolean true" not working

[Carl Karsten]

I get the same message, and I have:

d-i partman/unmount_active boolean false

My case: 
I have a 2nd usb stick with ubuntu-16.04.2-server-amd64.iso
the installer mounts it under /cdrom, and then asks me if I want to unmount it so it can step on it.  
perhaps this should be a special case?

Anyway, I wonder what the relation is between unmount_active and
 "Do you want the installer to try to unmount...?"

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to preseed in Ubuntu.
https://bugs.launchpad.net/bugs/1628659

Title:
  "d-i partman/unmount_active boolean true" not working

Status in preseed package in Ubuntu:
  Confirmed

Bug description:
  The installation with preseed of Ubuntu 16.04 server (and previous
  versions), on a KVM virtual machine keeps showing the message:

  '''
  The installer has detected that the following disks have mounted partitions
  /dev/vda
  Do you want the installer to try to unmount the partitions on this disk before continuing? If you leave them mounted, you will not be able to create, delete or resize partitions on this disk, but you may be able to install to existing partitions there.
  Unmount partitions that are in use?
  '''

  I do have the option:

  d-i partman/unmount_active boolean true

  and
  d-i preseed/early_command string umount /dev/media
  (also tried with)
  d-i preseed/early_command string umount /dev/vda
  d-i preseed/early_command string umount /dev/vda1

  Is this a bug, or am I missing something?

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/preseed/+bug/1628659/+subscriptions