[sage-support] Re: Problem installing sage on Ubuntu.

[slelievre]

Hi Maarten,

Binaries for Sage 9.3 and Sage 9.4 were prepared taking
advantage of too modern instruction sets not available
on older processors, so they only work with recent cpus.
The upcoming Sage 9.5 should work for everyone.

In the meantime, workarounds include

- build from source
- install via Conda
- build from source using prerequisites from Conda
- use Docker
- use SageCell
- use CoCalc

Good luck with your preferred solution.   --Samuel

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[sage-support] Problem installing sage on Ubuntu.

[Maarten Derickx]

Hi all,

I tried installing sage on Ubuntu 18.04.6 LTS by downloading 
sage-9.4-Ubuntu_18.04-x86_64.tar.bz2 
 
from one of the mirrors, unpacking the tar.bz2 file and then starting sage. 
However this results in a broken sage. Anyone any idea what is causing this?

Below is just one command that doesn't work, but there are multiple things 
causing similar stack traces.

┌┐

│ SageMath version 9.4, Release Date: 2021-08-22 │

│ Using Python 3.9.5. Type "help()" for help.│

└┘

sage: M = ModularSymbols(*79*) 
   

sage: S = M.cuspidal_submodule()   
 

---

KeyError  Traceback (most recent call last)

~/sages/SageMath/local/lib/python3.9/site-packages/sage/structure/category_object.pyx
 
in sage.structure.category_object.CategoryObject.getattr_from_category 
(build/cythonized/sage/structure/category_object.c:7074)()

*838* try:

--> 839 return self.__cached_methods[name]

*840* except KeyError:


KeyError: '_ModularSymbolsAmbient__cuspidal_submodule'


During handling of the above exception, another exception occurred:


AttributeErrorTraceback (most recent call last)

~/sages/SageMath/local/lib/python3.9/site-packages/sage/modular/modsym/ambient.py
 
in cuspidal_submodule(self)

*   1398* try:

-> 1399 return self.__cuspidal_submodule

*   1400* except AttributeError:


~/sages/SageMath/local/lib/python3.9/site-packages/sage/structure/category_object.pyx
 
in sage.structure.category_object.CategoryObject.__getattr__ 
(build/cythonized/sage/structure/category_object.c:6993)()

*832* """

--> 833 return self.getattr_from_category(name)

*834* 


~/sages/SageMath/local/lib/python3.9/site-packages/sage/structure/category_object.pyx
 
in sage.structure.category_object.CategoryObject.getattr_from_category 
(build/cythonized/sage/structure/category_object.c:7159)()

*847* 

--> 848 attr = getattr_from_other_class(self, cls, name)

*849* self.__cached_methods[name] = attr


~/sages/SageMath/local/lib/python3.9/site-packages/sage/cpython/getattr.pyx 
in sage.cpython.getattr.getattr_from_other_class 
(build/cythonized/sage/cpython/getattr.c:2551)()

*366* dummy_error_message.name = name

--> 367 raise AttributeError(dummy_error_message)

*368* cdef PyObject* attr = instance_getattr(cls, name)


AttributeError: 'MatrixSpace_with_category' object has no attribute 
'_cache__zero_matrix'


During handling of the above exception, another exception occurred:


SignalError   Traceback (most recent call last)

 in 

> 1 S = M.cuspidal_submodule()


~/sages/SageMath/local/lib/python3.9/site-packages/sage/modular/modsym/ambient.py
 
in cuspidal_submodule(self)

*   1404* except AttributeError:

*   1405* pass

-> 1406 S = self.boundary_map().kernel()

*   1407* S._set_is_cuspidal(True)

*   1408* S._is_full_hecke_module = True


~/sages/SageMath/local/lib/python3.9/site-packages/sage/modules/matrix_morphism.py
 
in kernel(self)

*714* []

*715* """

--> 716 V = self.matrix().kernel()

*717* D = self.domain()

*718* if not D.is_ambient():


~/sages/SageMath/local/lib/python3.9/site-packages/sage/matrix/matrix2.pyx 
in sage.matrix.matrix2.Matrix.left_kernel 
(build/cythonized/sage/matrix/matrix2.c:31551)()

*   4877* 

*   4878* tm = verbose("computing left kernel for %sx%s matrix" % (
self.nrows(), self.ncols()),level=1)

-> 4879 K = self.transpose().right_kernel(*args, **kwds)

*   4880* self.cache('left_kernel', K)

*   4881* verbose("done computing left kernel for %sx%s matrix" % (
self.nrows(), self.ncols()),level=1,t=tm)


~/sages/SageMath/local/lib/python3.9/site-packages/sage/matrix/matrix2.pyx 
in sage.matrix.matrix2.Matrix.right_kernel 
(build/cythonized/sage/matrix/matrix2.c:31019)()

*   4715* 

*   4716* # Go get the kernel matrix, this is where it all happens

-> 4717 M = self.right_kernel_matrix(*args, **kwds)

*   4718* 

*   4719* ambient = R**self.ncols()


~/sages/SageMath/local/lib/python3.9/site-packages/sage/matrix/matrix2.pyx 
in sage.matrix.matrix2.Matrix.right_kernel_matrix 
(build/cythonized/sage/matrix/matrix2.c:29656)()

*   4316* if M is None:

*   4317* try:

-> 4318 format, M = self._right_kernel_matrix(algorithm=
algorithm,