With a clean build on Ubuntu 20.04, ptestlong passes, but Jupyter does not
start anymore due to an SSL problem, using Sage's Python 3. (The system
Python 3.8 is not picked up because of missing dependencies sqlite and xz,
but that is ok.)
$ ./sage -n jupyter
Please wait while the Sage Jupyter Notebook server starts...
Traceback (most recent call last):
File
"/amd/compute/mwagerin/git/sage_compute/local/lib/python3.8/site-packages/sage/repl/ipython_kernel/install.py",
line 307, in have_prerequisites
from notebook.notebookapp import NotebookApp
File
"/amd/compute/mwagerin/git/sage_compute/local/lib/python3.8/site-packages/notebook/notebookapp.py",
line 66, in <module>
from tornado import httpserver
File
"/amd/compute/mwagerin/git/sage_compute/local/lib/python3.8/site-packages/tornado/httpserver.py",
line 29, in <module>
import ssl
File
"/amd/compute/mwagerin/git/sage_compute/local/lib/python3.8/ssl.py", line
98, in <module>
import _ssl # if we can't import it, let the error
propagate
ModuleNotFoundError: No module named '_ssl'
The Jupyter notebook requires ssl, even if you do not use
https. Install the openssl development packages in your system and
then rebuild Python (sage -f python3).
Which packages need to be installed for this and why was this not a problem
previously? OpenSSL is installed on the system:
$ openssl version
OpenSSL 1.1.1f 31 Mar 2020
On a different note, 9.2.beta11 has introduced crashes of the doctests in
`src/sage/interfaces/singular.py` that were reproducible on about 20% of
the test runs and have been observed by several other people as well. I
have tracked that issue down to the Pexpect upgrade in #29240 via
bisection. With 9.2.beta12 on the other hand, I cannot reproduce the
problem anymore, possibly because of the Python upgrade. There are still
reports about this with 9.2.beta12 though, so maybe this helps analyze the
problem.
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