#0  0x00007f21389ccd70 in pkgDepCache::CheckDep(pkgCache::DepIterator, int, pkgCache::PkgIterator&) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
No symbol table info available.
#1  0x00007f21389cd898 in pkgDepCache::DependencyState(pkgCache::DepIterator&) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
No symbol table info available.
#2  0x00007f21389d561b in pkgDepCache::Update(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
No symbol table info available.
#3  0x00007f21389d5b4e in pkgDepCache::Init(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
No symbol table info available.
#4  0x00007f2138cd4c9a in ?? () from /usr/lib/python2.7/dist-packages/apt_pkg.so
No symbol table info available.
#5  0x00000000004fe1d5 in PyEval_EvalFrameEx ()
No symbol table info available.
#6  0x000000000056c414 in PyEval_EvalCodeEx ()
No symbol table info available.
#7  0x00000000004fe58f in PyEval_EvalFrameEx ()
No symbol table info available.
#8  0x000000000056c414 in PyEval_EvalCodeEx ()
No symbol table info available.
#9  0x00000000005ba3b2 in PyEval_EvalCode ()
No symbol table info available.
#10 0x00000000005abe1b in ?? ()
No symbol table info available.
#11 0x000000000045270b in PyRun_FileExFlags ()
No symbol table info available.
#12 0x0000000000452f05 in PyRun_SimpleFileExFlags ()
No symbol table info available.
#13 0x0000000000453b6a in Py_Main ()
No symbol table info available.
#14 0x00007f2139601de5 in __libc_start_main (main=0x453c28 <main>, argc=2, ubp_av=0x7ffface71d58, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffface71d48) at libc-start.c:260
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 2715031095907429858, 5744344, 140736094215504, 0, 0, -2714857299075944990, -2598637846247395870}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x5bb4e0 <__libc_csu_init>, 0x7ffface71d58}, data = {prev = 0x0, cleanup = 0x0, canceltype = 6010080}}}
        not_first_call = <optimized out>
#15 0x000000000057a701 in _start ()
No symbol table info available.