Bug ID: 390438
           Summary: Luks encrypted partition: Deactivate fail
           Product: partitionmanager
           Version: 1.2.1
          Platform: Mint (Ubuntu based)
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
  Target Milestone: ---

Created attachment 110649
Partition Manager error on desacticating Luks partition

On Mint 18.3 KDE:

I have a hard drive with gpt partition table and a single encrypted luks


- Mount/decrypt using dolphin file manager
- Mount/decrypt encrypted partition from KDE Partition Manager

Not working:

- unmount/deactivate in KDE Partition Manager
 - Even if mounted using KDE Partition Manger 
- Provide useful error message detail


1. Mount an encrypted luks partition
2. In KDE Partition Manager right click on partition and choose "Desacticate"


Error message: "The file system on partition /deb/sb1 could not be unmounted"
Clicking on detail: "pre></pre>"

Note: AFAIK nothing was using the partition. Had no problem with unmounting in

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