(gdb) bt
#0  0x00007ffff7b7e37d in pkgCache::ReMap(bool const&) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
#1  0x00007ffff7b86249 in ?? () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
#2  0x00007ffff7b88495 in ?? () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
#3  0x00007ffff7aeb2b8 in pkgCacheFile::BuildCaches(OpProgress*, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
#4  0x000055555555da3d in ?? ()
#5  0x00007ffff7aff1b6 in CommandLine::DispatchArg(CommandLine::Dispatch const*, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
#6  0x00007ffff7830df3 in DispatchCommandLine(CommandLine&, std::vector<CommandLine::Dispatch, std::allocator<CommandLine::Dispatch> > const&) ()
   from /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0
#7  0x00005555555583ed in ?? ()
#8  0x00007ffff6ed9a00 in __libc_start_main (main=0x555555558310, argc=8, argv=0x7fffffffe5d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, 
    stack_end=0x7fffffffe5c8) at libc-start.c:289
#9  0x00005555555584b9 in ?? ()