Hi everyone,

I am having trouble with the SageMath. 


*1/ I've downloaded the binary tar 
file sage-9.1-Ubuntu_18.04-x86_64.tar.bz2 
fromhttps://www.sagemath.org/download-linux.html 
<https://www.sagemath.org/download-linux.html>*





*2/ Thentar jxvf sage-9.1-Ubuntu_18.04-x86_64.tar.bz2cd SageMath./sage -tp 
--long src/sage/manifolds*

However, instead of "All tests passed!", I get a multitude of errors. 

-a typical error is:

sage -t --long src/sage/manifolds/utilities.py
**********************************************************************
File "src/sage/manifolds/utilities.py", line 54, in 
sage.manifolds.utilities.SimplifySqrtReal
Failed example:
    assume(x<1)
Exception raised:
    Traceback (most recent call last):
      File 
"/home/taj/SageMath/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/home/taj/SageMath/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1123, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.manifolds.utilities.SimplifySqrtReal[0]>", line 
1, in <module>
        assume(x<Integer(1))
      File 
"/home/taj/SageMath/local/lib/python3.7/site-packages/sage/symbolic/assumptions.py",
 
line 627, in assume
        x.assume()
      File "sage/symbolic/expression.pyx", line 1877, in 
sage.symbolic.expression.Expression.assume 
(build/cythonized/sage/symbolic/expression.cpp:13564)
        m = self._maxima_init_assume_()
      File "sage/symbolic/expression.pyx", line 1953, in 
sage.symbolic.expression.Expression._maxima_init_assume_ 
(build/cythonized/sage/symbolic/expression.cpp:14329)
        m = '(%s)%s(%s)' % (l, maxima._relation_symbols()[op], r)
      File "sage/misc/lazy_import.pyx", line 321, in 
sage.misc.lazy_import.LazyImport.__getattr__ 
(build/cythonized/sage/misc/lazy_import.c:3536)
        return getattr(self.get_object(), attr)
      File "sage/misc/lazy_import.pyx", line 188, in 
sage.misc.lazy_import.LazyImport.get_object 
(build/cythonized/sage/misc/lazy_import.c:2347)
        return self._get_object()
      File "sage/misc/lazy_import.pyx", line 220, in 
sage.misc.lazy_import.LazyImport._get_object 
(build/cythonized/sage/misc/lazy_import.c:2586)
        self._object = getattr(__import__(self._module, {}, {}, 
[self._name]), self._name)
      File 
"/home/taj/SageMath/local/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py",
 
line 92, in <module>
        from sage.libs.ecl import EclObject, ecl_eval
    ImportError: 
/home/taj/SageMath/local/lib/python3.7/site-packages/sage/libs/
ecl.cpython-37m-x86_64-linux-gnu.so: undefined symbol: cl_env_p
**********************************************************************

I am using Ubuntu 18.04 LTS and have Python 2.7, 3.6, and 3.7 installed. 
Does anyone maybe have an idea of what could be causing these errors? Any 
help is very much appreciated.

Best regards,
Taj Jankovič

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