# import error on debian

I get this error

```
sage ~/src/brot.sage
Traceback (most recent call last):
File "/home/andreas/src/brot.sage.py", line 3, in <module>
from sage.all_cmdline import * # import sage library
File "/usr/lib/python2.7/dist-packages/sage/all_cmdline.py", line 26, in <module>
from sage.all import *
File "/usr/lib/python2.7/dist-packages/sage/all.py", line 102, in <module>
from sage.modular.all import *
File "/usr/lib/python2.7/dist-packages/sage/modular/all.py", line 4, in <module>
from .quatalg.all import *
File "/usr/lib/python2.7/dist-packages/sage/modular/quatalg/__init__.py", line 4, in <module>
from . import all
File "/usr/lib/python2.7/dist-packages/sage/modular/quatalg/all.py", line 3, in <module>
from .brandt import BrandtModule
File "/usr/lib/python2.7/dist-packages/sage/modular/quatalg/brandt.py", line 206, in <module>
from sage.modular.hecke.all import (AmbientHeckeModule, HeckeSubmodule, HeckeModuleElement)
File "/usr/lib/python2.7/dist-packages/sage/modular/hecke/all.py", line 20, in <module>
from .ambient_module import AmbientHeckeModule, is_AmbientHeckeModule
File "/usr/lib/python2.7/dist-packages/sage/modular/hecke/ambient_module.py", line 38, in <module>
from sage.modular.arithgroup.all import Gamma0 # for Sturm bound
File "/usr/lib/python2.7/dist-packages/sage/modular/arithgroup/__init__.py", line 4, in <module>
from . import all
File "/usr/lib/python2.7/dist-packages/sage/modular/arithgroup/all.py", line 6, in <module>
from .congroup_generic import is_CongruenceSubgroup, CongruenceSubgroup_constructor as CongruenceSubgroup
File "/usr/lib/python2.7/dist-packages/sage/modular/arithgroup/congroup_generic.py", line 28, in <module>
from sage.groups.matrix_gps.all import MatrixGroup
File "/usr/lib/python2.7/dist-packages/sage/groups/matrix_gps/all.py", line 13, in <module>
import sage.groups.matrix_gps.pickling_overrides
File "/usr/lib/python2.7/dist-packages/sage/groups/matrix_gps/pickling_overrides.py", line 7, in <module>
from sage.groups.matrix_gps.finitely_generated import FinitelyGeneratedMatrixGroup_gap
File "/usr/lib/python2.7/dist-packages/sage/groups/matrix_gps/finitely_generated.py", line 81, in <module>
from sage.groups.matrix_gps.matrix_group import (
File "/usr/lib/python2.7/dist-packages/sage/groups/matrix_gps/matrix_group.py", line 61, in <module>
from sage.groups.libgap_wrapper import ParentLibGAP
File "sage/libs/gap/element.pxd", line 32, in init sage.groups.libgap_wrapper (build/cythonized/sage/groups/libgap_wrapper.c:9846)
ImportError: /usr/lib/python2.7/dist-packages/sage/libs/gap/element.x86_64-linux-gnu.so: undefined symbol: _GAP_SetEnterStackCount
```

with this file: cat brot.sage

```
R, W, R_S, H, H_S, S = var('R W R_S H H_S S')
equations = [ S == R_S + H_S,
R_S == H_S,
(R + R_S + W) == 3 * R_S,
0.8*(W+R+R_S) == H + H_S,
W/(W+R+R_S) == 0.6,
R + W+ S +H == 0.85]
print solve(equations,[R, W, R_S, H, H_S,S ], algorithm="sympy", solution_dict=False)
sage --version
SageMath version 8.6, Release Date: 2019-01-15
```

I would like to calculate my bread receipt... what is the issue here? This used to work before.