Public bug reported:

Using current xenial
- try to remove a package
- confirm in the dialog
- deny the prompt asking for your user password

every few tries it segfaults in the apt plugin code

#0  0xb70b1c82 in g_variant_valist_get (app=0xbfffecd8, free=0, 
value=0xaab1b9b0, str=0xbfffecc4)
    at /build/glib2.0-Qx2vEO/glib2.0-2.47.6/./glib/gvariant.c:4913
#1  0xb70b1c82 in g_variant_valist_get (str=str@entry=0xbfffecc4, 
value=<optimized out>, value@entry=0xaab1b9b0, free=free@entry=0, 
app=0xbfffecd8)
    at /build/glib2.0-Qx2vEO/glib2.0-2.47.6/./glib/gvariant.c:5097
#2  0xb70b1b2d in g_variant_valist_get (str=str@entry=0xbfffecc4, 
value=<optimized out>, value@entry=0xaab39878, free=free@entry=0, 
app=0xbfffecd8)
    at /build/glib2.0-Qx2vEO/glib2.0-2.47.6/./glib/gvariant.c:5132
#3  0xb70b297a in g_variant_get_va (value=0xaab39878, format_string=0xb373d480 
"s)", endptr=0x0, app=0xbfffecd8)
    at /build/glib2.0-Qx2vEO/glib2.0-2.47.6/./glib/gvariant.c:5359
#4  0xb70b2bf4 in g_variant_get (value=0xaab39878, format_string=0xb373d47f 
"(s)") at /build/glib2.0-Qx2vEO/glib2.0-2.47.6/./glib/gvariant.c:5306
#5  0xb373b837 in transaction_finished_cb (connection=0x810eb40 
[GDBusConnection], sender_name=0xb2c0b4c0 ":1.187", object_path=0xb2c0b1d0 
"/org/debian/apt/transaction/aa6b6c9fdc5e409d8c1ca0f598f89c6b", 
interface_name=0xb2c08520 "org.debian.apt.transaction", signal_name=0xb2c03a28 
"Finished", parameters=0xaab39878, user_data=0xaf7b3f5c) at gs-plugin-apt.c:564
#6  0xb7285f9f in emit_signal_instance_in_idle_cb (data=0xb2c0b280)
    at /build/glib2.0-Qx2vEO/glib2.0-2.47.6/./gio/gdbusconnection.c:3701
#7  0xb7073570 in g_idle_dispatch (source=0xb2c09690, callback=0xb7285f20 
<emit_signal_instance_in_idle_cb>, user_data=0xb2c0b280)
    at /build/glib2.0-Qx2vEO/glib2.0-2.47.6/./glib/gmain.c:5441
#8  0xb7076cfb in g_main_context_dispatch (context=0x8106458)

** Affects: gnome-software (Ubuntu)
     Importance: High
         Status: New

** Changed in: gnome-software (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1549890

Title:
  Segfault sometimes when auth denied

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