. Thread 4 (Thread 0x7fe0e11ea700 (LWP 2002)): #0 0x00007fe0ec917733 in poll () from /lib/x86_64-linux-gnu/libc.so.6 No symbol table info available. #1 0x00007fe0eb808f18 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #2 0x00007fe0eb809742 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #3 0x00007fe0e37699cb in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so No symbol table info available. #4 0x00007fe0eb82e266 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #5 0x00007fe0eda8aefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 No symbol table info available. #6 0x00007fe0ec92385d in clone () from /lib/x86_64-linux-gnu/libc.so.6 No symbol table info available. #7 0x0000000000000000 in ?? () No symbol table info available. . Thread 3 (Thread 0x7fe0e09e9700 (LWP 2003)): #0 0x00007fe0ec917733 in poll () from /lib/x86_64-linux-gnu/libc.so.6 No symbol table info available. #1 0x00007fe0eb808f18 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #2 0x00007fe0eb809742 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #3 0x00007fe0eb33b5c6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 No symbol table info available. #4 0x00007fe0eb82e266 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #5 0x00007fe0eda8aefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 No symbol table info available. #6 0x00007fe0ec92385d in clone () from /lib/x86_64-linux-gnu/libc.so.6 No symbol table info available. #7 0x0000000000000000 in ?? () No symbol table info available. . Thread 2 (Thread 0x7fe0d9b08700 (LWP 2004)): #0 0x00007fe0eda8f3cb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0 No symbol table info available. #1 0x00007fe0eac6e375 in ?? () from /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 No symbol table info available. #2 0x00007fe0eb7dd43f in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #3 0x00007fe0eb7ddc91 in g_async_queue_timed_pop () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #4 0x00007fe0eb8306a7 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #5 0x00007fe0eb82e266 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #6 0x00007fe0eda8aefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 No symbol table info available. #7 0x00007fe0ec92385d in clone () from /lib/x86_64-linux-gnu/libc.so.6 No symbol table info available. #8 0x0000000000000000 in ?? () No symbol table info available. . Thread 1 (Thread 0x7fe0edea9720 (LWP 2001)): #0 0x00007fe0e22c5e9e in pkgDepCache::UpdateVerState(pkgCache::PkgIterator) () from /usr/lib/libapt-pkg.so.4.11 No symbol table info available. #1 0x00007fe0e22c620d in pkgDepCache::Update(OpProgress*) () from /usr/lib/libapt-pkg.so.4.11 No symbol table info available. #2 0x00007fe0e22cb48e in pkgDepCache::Init(OpProgress*) () from /usr/lib/libapt-pkg.so.4.11 No symbol table info available. #3 0x00007fe0e22f545d in pkgCacheFile::BuildDepCache(OpProgress*) () from /usr/lib/libapt-pkg.so.4.11 No symbol table info available. #4 0x00007fe0e22f54da in pkgCacheFile::Open(OpProgress*, bool) () from /usr/lib/libapt-pkg.so.4.11 No symbol table info available. #5 0x00007fe0e25b2f4a in ?? () from /usr/lib/python2.7/dist-packages/apt_pkg.so No symbol table info available. #6 0x000000000047c295 in ?? () No symbol table info available. #7 0x000000000041ae2a in PyObject_Call () No symbol table info available. #8 0x00000000004b6dbe in PyEval_EvalFrameEx () No symbol table info available. #9 0x00000000004bcecd in PyEval_EvalCodeEx () No symbol table info available. #10 0x00000000004b6c7b in PyEval_EvalFrameEx () No symbol table info available. #11 0x00000000004bcecd in PyEval_EvalCodeEx () No symbol table info available. #12 0x000000000044914f in ?? () No symbol table info available. #13 0x000000000041ae2a in PyObject_Call () No symbol table info available. #14 0x000000000043096e in ?? () No symbol table info available. #15 0x000000000041ae2a in PyObject_Call () No symbol table info available. #16 0x00000000004b6dbe in PyEval_EvalFrameEx () No symbol table info available. #17 0x00000000004bcecd in PyEval_EvalCodeEx () No symbol table info available. #18 0x000000000044914f in ?? () No symbol table info available. #19 0x000000000041ae2a in PyObject_Call () No symbol table info available. #20 0x000000000043096e in ?? () No symbol table info available. #21 0x000000000041ae2a in PyObject_Call () No symbol table info available. #22 0x0000000000480de3 in ?? () No symbol table info available. #23 0x000000000047c341 in ?? () No symbol table info available. #24 0x000000000041ae2a in PyObject_Call () No symbol table info available. #25 0x00000000004b6dbe in PyEval_EvalFrameEx () No symbol table info available. #26 0x00000000004b6f97 in PyEval_EvalFrameEx () No symbol table info available. #27 0x00000000004b6f97 in PyEval_EvalFrameEx () No symbol table info available. #28 0x00000000004b6f97 in PyEval_EvalFrameEx () No symbol table info available. #29 0x00000000004bcecd in PyEval_EvalCodeEx () No symbol table info available. #30 0x00000000004bd9a2 in PyEval_EvalCode () No symbol table info available. #31 0x00000000004dce52 in ?? () No symbol table info available. #32 0x00000000004dda14 in PyRun_FileExFlags () No symbol table info available. #33 0x00000000004de51e in PyRun_SimpleFileExFlags () No symbol table info available. #34 0x00000000004ee8bd in Py_Main () No symbol table info available. #35 0x00007fe0ec86330d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6 No symbol table info available. #36 0x000000000041ccf9 in _start () No symbol table info available.