I've the same problem - after upgrading to 16.04 xenial I get the same pop-up window.

Failure to download extra data files

The following packages requested additional data downloads after package installation, but the data could not be downloaded or could not be processed.

lovefilm-desktop, wine-browser-installer, wine-silverlight5.1-installer

The download will be attempted again later, or you can try the download again now.  Running this command requires an active Internet connection.

[x64 stacktrace]
SourcePackage: apt
Stacktrace:
 #0  0x00007fb73069f418 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
         resultvar = 0
         pid = 8080
         selftid = 8080
 #1  0x00007fb7306a101a in __GI_abort () at abort.c:89
         save_stage = 2
         act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 140424771724608, 140424768269103, 140424771724608, 1, 10, 140424768784912, 10, 140424771729264, 140424785635104, 140424768784912, 1, 140424785637456, 93987686793024, 140424771729264, 140424785635136}}, sa_flags = 818763904, sa_restorer = 0x557b36af9dc8}
         sigs = {__val = {32, 0 <repeats 15 times>}}
 #2  0x00007fb730cd884d in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #3  0x00007fb730cd66b6 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #4  0x00007fb730cd6701 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #5  0x00007fb730cd6919 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #6  0x00007fb730cff3e7 in std::__throw_out_of_range_fmt(char const*, ...) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #7  0x00007fb731282546 in pkgAcquire::Worker::RunMessages() () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #8  0x00007fb731282c9c in pkgAcquire::Worker::InFdReady() () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #9  0x00007fb73128430a in pkgAcquire::RunFdsSane(fd_set*, fd_set*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #10 0x00007fb731287b52 in pkgAcquire::Run(int) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #11 0x00007fb730fe5503 in AcquireRun(pkgAcquire&, int, bool*, bool*) () from /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0
 No symbol table info available.
 #12 0x0000557b349c7c06 in ?? ()
 No symbol table info available.
 #13 0x00007fb7312b17a6 in CommandLine::DispatchArg(CommandLine::Dispatch const*, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #14 0x00007fb730fe0df3 in DispatchCommandLine(CommandLine&, std::vector<CommandLine::Dispatch, std::allocator<CommandLine::Dispatch> > const&) () from /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0
 No symbol table info available.
 #15 0x0000557b349c665c in ?? ()
 No symbol table info available.
 #16 0x00007fb73068a830 in __libc_start_main (main=0x557b349c65d0, argc=5, argv=0x7ffd7842c448, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7ffd7842c438) at ../csu/libc-start.c:291
         result = <optimised out>
         unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 7365791385207139403, 93987652003568, 140726621094976, 0, 0, 3689597641234541643, 3720120443841506379}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7ffd7842c478, 0x7fb7317b4168}, data = {prev = 0x0, cleanup = 0x0, canceltype = 2017641592}}}
         not_first_call = <optimised out>
 #17 0x0000557b349c6719 in ?? ()
 No symbol table info available.
StacktraceAddressSignature: /usr/lib/apt/apt-helper:6:/lib/x86_64-linux-gnu/libc-2.23.so+35418:/lib/x86_64-linux-gnu/libc-2.23.so+3701a:/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21+8f84d:/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21+8d6b6:/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21+8d701:/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21+8d919:/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21+b63e7:/usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0.0+64546:/usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0.0+64c9c:/usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0.0+6630a:/usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0.0+69b52:/usr/lib/x86_64-linux-gnu/libapt-private.so.0.0.0+1a503:/usr/lib/apt/apt-helper+3c06:/usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0.0+937a6:/usr/lib/x86_64-linux-gnu/libapt-private.so.0.0.0+15df3
StacktraceTop:
 __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 std::__throw_out_of_range_fmt(char const*, ...) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
Tags:  xenial
ThreadStacktrace:
 .
 Thread 1 (LWP 8080):
 #0  0x00007fb73069f418 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
         resultvar = 0
         pid = 8080
         selftid = 8080
 #1  0x00007fb7306a101a in __GI_abort () at abort.c:89
         save_stage = 2
         act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 140424771724608, 140424768269103, 140424771724608, 1, 10, 140424768784912, 10, 140424771729264, 140424785635104, 140424768784912, 1, 140424785637456, 93987686793024, 140424771729264, 140424785635136}}, sa_flags = 818763904, sa_restorer = 0x557b36af9dc8}
         sigs = {__val = {32, 0 <repeats 15 times>}}
 #2  0x00007fb730cd884d in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #3  0x00007fb730cd66b6 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #4  0x00007fb730cd6701 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #5  0x00007fb730cd6919 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #6  0x00007fb730cff3e7 in std::__throw_out_of_range_fmt(char const*, ...) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 No symbol table info available.
 #7  0x00007fb731282546 in pkgAcquire::Worker::RunMessages() () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #8  0x00007fb731282c9c in pkgAcquire::Worker::InFdReady() () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #9  0x00007fb73128430a in pkgAcquire::RunFdsSane(fd_set*, fd_set*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #10 0x00007fb731287b52 in pkgAcquire::Run(int) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #11 0x00007fb730fe5503 in AcquireRun(pkgAcquire&, int, bool*, bool*) () from /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0
 No symbol table info available.
 #12 0x0000557b349c7c06 in ?? ()
 No symbol table info available.
 #13 0x00007fb7312b17a6 in CommandLine::DispatchArg(CommandLine::Dispatch const*, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
 No symbol table info available.
 #14 0x00007fb730fe0df3 in DispatchCommandLine(CommandLine&, std::vector<CommandLine::Dispatch, std::allocator<CommandLine::Dispatch> > const&) () from /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0
 No symbol table info available.
 #15 0x0000557b349c665c in ?? ()
 No symbol table info available.
 #16 0x00007fb73068a830 in __libc_start_main (main=0x557b349c65d0, argc=5, argv=0x7ffd7842c448, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7ffd7842c438) at ../csu/libc-start.c:291
         result = <optimised out>
         unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 7365791385207139403, 93987652003568, 140726621094976, 0, 0, 3689597641234541643, 3720120443841506379}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7ffd7842c478, 0x7fb7317b4168}, data = {prev = 0x0, cleanup = 0x0, canceltype = 2017641592}}}
         not_first_call = <optimised out>
 #17 0x0000557b349c6719 in ?? ()
 No symbol table info available.
Title: apt-helper crashed with SIGABRT in __gnu_cxx::__verbose_terminate_handler()
UpgradeStatus: Upgraded to xenial on 2016-05-04 (5 days ago)
_MarkForUpload: True