.
Thread 1 (process 9651):
#0  pkgDepCache::UpdateVerState (this=0x21506a0, Pkg=
      {Pkg = 0x7f48d4fa6a10, Owner = 0x20b2440, HashIndex = 1596})
    at ../build/include/apt-pkg/cacheiterators.h:430
	D = {Dep = 0x7f48d4fef9a0, Type = 3600892601, Owner = 0x20b2440}
	State = (pkgDepCache::StateCache &) @0x7f48d4abd9e0: {
  CandVersion = 0x7f48d6a7c157 "", CurVersion = 0x7f48d6a7c157 "", 
  CandidateVer = 0x0, InstallVer = 0x40000000, Flags = 0, iFlags = 0, 
  Marked = false, Garbage = false, Status = 2 '\002', Mode = 1 '\001', 
  DepState = 255 '?'}
#1  0x00007f48d6a15a89 in pkgDepCache::Update (this=0x21506a0, 
    Prog=0x7fffdff10d30) at depcache.cc:641
	I = {Pkg = 0x7f48d4fa6a10, Owner = 0x20b2440, HashIndex = 1596}
	Done = <value optimized out>
#2  0x00007f48d6a1a0a1 in pkgDepCache::Init (this=0x21506a0, 
    Prog=0x7fffdff10d30) at depcache.cc:154
	actions = {cache = @0x21506a0, released = false}
#3  0x00007f48d6a3884b in pkgCacheFile::Open (this=0x20588d0, 
    Progress=@0x7fffdff10d30, WithLock=<value optimized out>)
    at cachefile.cc:103
No locals.
#4  0x00007f48d6cac03e in TmpGetCache (Self=<value optimized out>, 
    Args=<value optimized out>) at python/cache.cc:941
	progress = {<OpProgress> = {_vptr.OpProgress = 0x7f48d6eb9a90, 
    Current = 35074, Total = 70148, Size = 35074, SubTotal = 35074, 
    LastPercent = 88.0053635, LastTime = {tv_sec = 1239313808, 
      tv_usec = 347210}, LastOp = {static npos = 18446744073709551615, 
      _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
        _M_p = 0x20b1f48 "Building dependency tree"}}, LastSubOp = {
      static npos = 18446744073709551615, 
      _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
        _M_p = 0x20b1ab8 "Dependency generation"}}, Op = {
      static npos = 18446744073709551615, 
      _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
        _M_p = 0x2150338 "Building dependency tree"}}, SubOp = {
      static npos = 18446744073709551615, 
      _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
        _M_p = 0x20b1ab8 "Dependency generation"}}, Percent = 88.2334518, 
    MajorChange = false}, <PyCallbackObj> = {
    callbackInst = 0x7f48d7e201d0}, <No data fields>}
	pyCallbackInst = (PyObject *) 0x7f48d7e201d0
	Cache = <value optimized out>
	CacheFileObj = <value optimized out>
	CacheObj = <value optimized out>
#5  0x00000000004a2b03 in PyEval_EvalFrameEx (f=0x2048b90, 
    throwflag=<value optimized out>) at ../Python/ceval.c:3706
	sp = (PyObject **) 0x2048d68
	stack_pointer = (PyObject **) 0x2048d70
	next_instr = (unsigned char *) 0x2049e30 "}\001"
	opcode = <value optimized out>
	oparg = <value optimized out>
	why = <value optimized out>
	err = 0
	x = <value optimized out>
	v = (PyObject *) 0x1fd1750
	w = (PyObject *) 0x20ae498
	u = (PyObject *) 0x2700533b90
	t = <value optimized out>
	stream = (PyObject *) 0x4509e5
	freevars = (PyObject **) 0x2048d58
	retval = (PyObject *) 0x0
	tstate = (PyThreadState *) 0x1fa60a0
	co = (PyCodeObject *) 0x7f48d7e0a3f0
	instr_ub = -1
	instr_lb = 0
	instr_prev = -1
	first_instr = <value optimized out>
	names = (PyObject *) 0x20480e0
	consts = (PyObject *) 0x7f48d7ec7488
#6  0x00000000004a4649 in PyEval_EvalCodeEx (co=0x7f48d7e0a3f0, 
    globals=<value optimized out>, locals=<value optimized out>, 
    args=0x7f48d7e10504, argcount=1, kws=0x203c808, kwcount=0, 
    defs=0x7f48d7e0fe28, defcount=1, closure=0x0) at ../Python/ceval.c:2968
	f = (PyFrameObject *) 0x2048b90
	retval = <value optimized out>
	freevars = (PyObject **) 0x2048d58
	tstate = (PyThreadState *) 0x1fa60a0
	x = <value optimized out>
	u = (PyObject *) 0x7f48d7eb99e8
#7  0x00000000004a2cb0 in PyEval_EvalFrameEx (f=0x203c680, 
    throwflag=<value optimized out>) at ../Python/ceval.c:3802
	sp = (PyObject **) 0x203c808
	stack_pointer = (PyObject **) 0x203c808
	next_instr = (unsigned char *) 0x2041dbc "\001n\001"
	opcode = <value optimized out>
	oparg = <value optimized out>
	why = <value optimized out>
	err = 0
	x = <value optimized out>
	v = (PyObject *) 0x7f48d7ec0e10
	w = (PyObject *) 0x1900000570
	u = (PyObject *) 0x220203fd40
	t = <value optimized out>
	stream = (PyObject *) 0x7fffdff1126f
	freevars = (PyObject **) 0x203c7f8
	retval = (PyObject *) 0x0
	tstate = (PyThreadState *) 0x1fa60a0
	co = (PyCodeObject *) 0x7f48d7e0a468
	instr_ub = -1
	instr_lb = 0
	instr_prev = -1
	first_instr = <value optimized out>
	names = (PyObject *) 0x203fd40
	consts = (PyObject *) 0x20072f0
#8  0x00000000004a4649 in PyEval_EvalCodeEx (co=0x7f48d7e0a468, 
    globals=<value optimized out>, locals=<value optimized out>, args=0x0, 
    argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0, closure=0x0)
    at ../Python/ceval.c:2968
	f = (PyFrameObject *) 0x203c680
	retval = <value optimized out>
	freevars = (PyObject **) 0x203c7f8
	tstate = (PyThreadState *) 0x1fa60a0
	x = <value optimized out>
	u = (PyObject *) 0x203c680
#9  0x00000000004a4762 in PyEval_EvalCode (co=0x21506a0, globals=0x20b2440, 
    locals=0x7f48d4fa6a10) at ../Python/ceval.c:522
No locals.
#10 0x00000000004c4c3c in PyRun_FileExFlags (fp=0x202a2a0, 
    filename=0x7fffdff11be7 "/usr/lib/update-notifier/apt-check", 
    start=<value optimized out>, globals=0x1fd1750, locals=0x1fd1750, 
    closeit=1, flags=0x7fffdff117a0) at ../Python/pythonrun.c:1335
	ret = (PyObject *) 0x0
	mod = <value optimized out>
	arena = <value optimized out>
#11 0x00000000004c4f6b in PyRun_SimpleFileExFlags (fp=0x202a2a0, 
    filename=0x7fffdff11be7 "/usr/lib/update-notifier/apt-check", closeit=1, 
    flags=0x7fffdff117a0) at ../Python/pythonrun.c:931
	m = <value optimized out>
	d = (PyObject *) 0x1fd1750
	v = <value optimized out>
	ext = <value optimized out>
	set_file_name = 1
	ret = <value optimized out>
	len = 1073741824
#12 0x00000000004189ce in Py_Main (argc=<value optimized out>, 
    argv=0x7fffdff118b8) at ../Modules/main.c:599
	c = <value optimized out>
	sts = 0
	command = 0x0
	filename = 0x20b2440 "\220P??H\177"
	module = 0x0
	fp = (FILE *) 0x202a2a0
	p = <value optimized out>
	unbuffered = <value optimized out>
	skipfirstline = 0
	stdin_is_interactive = 0
	help = <value optimized out>
	version = <value optimized out>
	saw_unbuffered_flag = 0
	cf = {cf_flags = 0}
#13 0x00007f48d6edd5a6 in __libc_start_main (main=0x417bb0 <main>, argc=2, 
    ubp_av=0x7fffdff118b8, init=0x54a180 <__libc_csu_init>, 
    fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fffdff118a8) at libc-start.c:220
	result = <value optimized out>
	unwind_buf = {cancel_jmp_buf = {{jmp_buf = {5546368, 
        -2555856720421556999, 4291264, 140736950507696, 0, 0, 
        2555927172113657081, 2456265000696179961}, mask_was_saved = 0}}, 
  priv = {pad = {0x0, 0x0, 0x2, 0x417bb0}, data = {prev = 0x0, cleanup = 0x0, 
      canceltype = 2}}}
	not_first_call = <value optimized out>
#14 0x0000000000417ae9 in _start () at ../sysdeps/x86_64/elf/start.S:113
No locals.