.
Thread 1 (Thread 0x7f1ab0c2c720 (LWP 6109)):
#0  0x00007f1aaec68c4e in pkgDepCache::UpdateVerState(pkgCache::PkgIterator) () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#1  0x00007f1aaec68fbd in pkgDepCache::Update(OpProgress*) () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#2  0x00007f1aaec6e23e in pkgDepCache::Init(OpProgress*) () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#3  0x00007f1aaec981fd in pkgCacheFile::BuildDepCache(OpProgress*) () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#4  0x00007f1aaec9827a in pkgCacheFile::Open(OpProgress*, bool) () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#5  0x00007f1aaef54f4a in ?? () from /usr/lib/python2.7/dist-packages/apt_pkg.so
No symbol table info available.
#6  0x000000000047c215 in ?? ()
No symbol table info available.
#7  0x000000000041ad3a in PyObject_Call ()
No symbol table info available.
#8  0x00000000004b6c8e in PyEval_EvalFrameEx ()
No symbol table info available.
#9  0x00000000004bce3d in PyEval_EvalCodeEx ()
No symbol table info available.
#10 0x00000000004b6b4b in PyEval_EvalFrameEx ()
No symbol table info available.
#11 0x00000000004bce3d in PyEval_EvalCodeEx ()
No symbol table info available.
#12 0x00000000004bd922 in PyEval_EvalCode ()
No symbol table info available.
#13 0x00000000004dcd42 in ?? ()
No symbol table info available.
#14 0x00000000004dd904 in PyRun_FileExFlags ()
No symbol table info available.
#15 0x00000000004de40e in PyRun_SimpleFileExFlags ()
No symbol table info available.
#16 0x00000000004ee80d in Py_Main ()
No symbol table info available.
#17 0x00007f1aaf5ff30d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#18 0x000000000041cb79 in _start ()
No symbol table info available.