. Thread 2 (Thread 3884): #0 0x00007f23eca16b8d in read () from /lib/libpthread.so.0 No symbol table info available. #1 0x00007f23ea2d998b in ?? () from /lib/libglib-2.0.so.0 No symbol table info available. #2 0x00007f23ea2ff304 in ?? () from /lib/libglib-2.0.so.0 No symbol table info available. #3 0x00007f23eca0f971 in start_thread () from /lib/libpthread.so.0 No symbol table info available. #4 0x00007f23eb8e794d in clone () from /lib/libc.so.6 No symbol table info available. #5 0x0000000000000000 in ?? () No symbol table info available. . Thread 1 (Thread 3854): #0 0x00007f23e8405dc6 in pkgDepCache::ActionGroup::release() () from /usr/lib/libapt-pkg.so.4.10 No symbol table info available. #1 0x00007f23e86e0392 in ?? () from /usr/lib/python2.7/dist-packages/apt_pkg.so No symbol table info available. #2 0x0000000000423a87 in PyObject_CallFunctionObjArgs () No symbol table info available. #3 0x00000000004a9ee6 in PyEval_EvalFrameEx () No symbol table info available. #4 0x00000000004ad00d in PyEval_EvalFrameEx () No symbol table info available. #5 0x00000000004ae016 in PyEval_EvalCodeEx () No symbol table info available. #6 0x00000000004ac3d9 in PyEval_EvalFrameEx () No symbol table info available. #7 0x00000000004ae016 in PyEval_EvalCodeEx () No symbol table info available. #8 0x000000000055aee2 in ?? () No symbol table info available. #9 0x0000000000422cb7 in PyObject_Call () No symbol table info available. #10 0x00000000004aa7cc in PyEval_EvalFrameEx () No symbol table info available. #11 0x00000000004ae016 in PyEval_EvalCodeEx () No symbol table info available. #12 0x000000000055aee2 in ?? () No symbol table info available. #13 0x0000000000422cb7 in PyObject_Call () No symbol table info available. #14 0x000000000042c0cf in ?? () No symbol table info available. #15 0x0000000000422cb7 in PyObject_Call () No symbol table info available. #16 0x00000000004a69a7 in PyEval_CallObjectWithKeywords () No symbol table info available. #17 0x00007f23ea58285b in _pyglib_handler_marshal () from /usr/lib/libpyglib-2.0-python2.7.so.0 No symbol table info available. #18 0x00007f23ea2d7add in g_main_context_dispatch () from /lib/libglib-2.0.so.0 No symbol table info available. #19 0x00007f23ea2d82c8 in ?? () from /lib/libglib-2.0.so.0 No symbol table info available. #20 0x00007f23ea2d890a in g_main_loop_run () from /lib/libglib-2.0.so.0 No symbol table info available. #21 0x00007f23ea78ee71 in ?? () from /usr/lib/pymodules/python2.7/gtk-2.0/glib/_glib.so No symbol table info available. #22 0x00000000004abfd0 in PyEval_EvalFrameEx () No symbol table info available. #23 0x00000000004ad00d in PyEval_EvalFrameEx () No symbol table info available. #24 0x00000000004ad00d in PyEval_EvalFrameEx () No symbol table info available. #25 0x00000000004ae016 in PyEval_EvalCodeEx () No symbol table info available. #26 0x00000000004ae122 in PyEval_EvalCode () No symbol table info available. #27 0x00000000004d35b4 in PyRun_SimpleFileExFlags () No symbol table info available. #28 0x0000000000418ce9 in Py_Main () No symbol table info available. #29 0x00007f23eb81fd8e in __libc_start_main () from /lib/libc.so.6 No symbol table info available. #30 0x0000000000417f29 in _start () No symbol table info available.