[Bug 1769594] [NEW] usb-creator continues installing after cancel selected

[Paul Worrall]

Public bug reported:

When writing an iso to USB stick, I click 'Cancel' on the progress bar
dialog, and then click 'Yes' on the 'Do you really want to quit' dialog
but the installation still continues silently in the background

There is still a usb-creator-kde process running, and dbus-monitor
--system shows USBCreator Progress signals still generated.  Eventually
it finishes and the Device Notifier pops up to confirm the new device is
ready.

Using usb-creator-kde from Kubuntu 18.04 LTS
paul at desktop:~$ sudo apt-cache policy usb-creator-kde
usb-creator-kde:
  Installed: 0.3.5
  Candidate: 0.3.5
  Version table:
 *** 0.3.5 500
        500 http://mirror.ox.ac.uk/sites/archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

** Affects: usb-creator (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1769594

Title:
  usb-creator continues installing after cancel selected

Status in usb-creator package in Ubuntu:
  New

Bug description:
  When writing an iso to USB stick, I click 'Cancel' on the progress bar
  dialog, and then click 'Yes' on the 'Do you really want to quit'
  dialog but the installation still continues silently in the background

  There is still a usb-creator-kde process running, and dbus-monitor
  --system shows USBCreator Progress signals still generated.
  Eventually it finishes and the Device Notifier pops up to confirm the
  new device is ready.

  Using usb-creator-kde from Kubuntu 18.04 LTS
  paul at desktop:~$ sudo apt-cache policy usb-creator-kde
  usb-creator-kde:
    Installed: 0.3.5
    Candidate: 0.3.5
    Version table:
   *** 0.3.5 500
          500 http://mirror.ox.ac.uk/sites/archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
          100 /var/lib/dpkg/status

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