I too tested this PPA in Trusty and confirm that unmounting/ejecting
devices now works as it should do.

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https://bugs.launchpad.net/bugs/1316509

Title:
  GtkFileChooser crashes due to a signal connection left behind by
  GtkMountOperation

Status in GTK+ GUI Toolkit:
  Fix Released
Status in “gtk+2.0” package in Ubuntu:
  New

Bug description:
  Note: This bug has been reported upstream and also fixed (the patch
  attached is from the upstream bugreport).

  [Impact]
   * Unmounting/ejecting a volume can lead to crashes/segfaults.
   * This bug is quite critical for users of Xubuntu and Ubuntu Studio, as it 
affects the file-manager Thunar, which is still Gtk2. (The problem occurs when 
users unmount a volume.)
   * A detailed description/explanation of the patch is included in the 
upstream bugreport.

  [Test Case]
   * Test-case from the upstream bugreport
  1. The system has a volume (partition, connected USB stick, whatever else) 
that
  is not mounted at the moment.
  2. Launch smplayer (the bug may trigger with other apps as well).
  3. Select "Open" => "File...". The dialog appears.
  4. Click on the volume label in the dialog for the volume to be mounted.
  5. Select a file on the volume.
  6. Click "Open".
   * Our users have also reported frequently that unmounting/ejecting of 
network drives can cause this problem. Thunar only segfaults/hangs on quitting.

  [Regression Potential]
   * Practically zero, as the patch only removes a signal connection.
   * This will obviously only affect distros/desktops that rely on Gtk2.

  [Other Info]
   * Upstream, this patch has only been merged into Gtk3, but it also applies 
in Gtk2. As Gtk2 is crucial for some members of the Ubuntu family (namely 
Xubuntu and Ubuntu Studio), we need this patch for Gtk2 as well.
   * This bug is one of the most frequently reported ones on Xubuntu's 
bugtracker. Obviously most users filed it against our file-manager (which 
exposes the bug), e.g. 
https://bugs.launchpad.net/ubuntu/+source/thunar/+bug/1203296

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