Thanks Samy, I assume these lines are the ones you're referring to:

Oct 22 18:30:35 username kernel: DMAR-IR: [Firmware Bug]: ioapic 2 has no 
mapping iommu, interrupt remapping will be disabled
Oct 22 18:30:35 username kernel: DMAR-IR: Failed to enable irq remapping. You 
are vulnerable to irq-injection attacks.

These messages indicate that either your hardware is missing features or
the firmware tables that describes the hardware is missing descriptions
for the feature. The summary is that you should not use I/O pass-through
for some devices on this system when you use virtualization systems such
as kvm, virtualbox, xen, or vmware.

As for the original issue about "Ask each time", I hope someone from the
desktop teams can take a look.

Thanks

** Changed in: nautilus (Ubuntu)
       Status: Incomplete => New

** Information type changed from Public Security to Public

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https://bugs.launchpad.net/bugs/1509068

Title:
  "Ask each time" option does not work when launching executable text
  files in GUI.

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