#0  0x00007f62aeb6df20 in pkgPolicy::GetCandidateVer(pkgCache::PkgIterator const&) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
No symbol table info available.
#1  0x00007f62aeb3d13b in pkgDepCache::Init(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
No symbol table info available.
#2  0x00007f62aeb6bcad in pkgCacheFile::BuildDepCache(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
No symbol table info available.
#3  0x00007f62aeb6bd2a in pkgCacheFile::Open(OpProgress*, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
No symbol table info available.
#4  0x000000000040f0b4 in ?? ()
No symbol table info available.
#5  0x00007f62aeb241e3 in CommandLine::DispatchArg(CommandLine::Dispatch*, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
No symbol table info available.
#6  0x0000000000409ad4 in ?? ()
No symbol table info available.
#7  0x00007f62ae23576d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#8  0x0000000000409df1 in ?? ()
No symbol table info available.
#9  0x00007fffa7b045e8 in ?? ()
No symbol table info available.
#10 0x000000000000001c in ?? ()
No symbol table info available.
#11 0x0000000000000004 in ?? ()
No symbol table info available.
#12 0x00007fffa7b05f08 in ?? ()
No symbol table info available.
#13 0x00007fffa7b05f10 in ?? ()
No symbol table info available.
#14 0x00007fffa7b05f16 in ?? ()
No symbol table info available.
#15 0x00007fffa7b05f19 in ?? ()
No symbol table info available.
#16 0x0000000000000000 in ?? ()
No symbol table info available.