On Ubuntu 20.04 running on Intel Core i7-8665U + 32 GB RAM:

- incremental build (-j8) from 9.2.beta14 with system Python (=3.8.2): OK
- all tests from ptestlong passed, except for 

sage -t --long --warn-long 74.5 --random-seed=0 
src/sage/quadratic_forms/quadratic_form__equivalence_testing.py
**********************************************************************
File "src/sage/quadratic_forms/quadratic_form__equivalence_testing.py", 
line 90, in 
sage.quadratic_forms.quadratic_form__equivalence_testing.is_globally_equivalent_to
Failed example:
    Q.is_globally_equivalent_to(P)
Expected:
    False
Got:
    True
**********************************************************************
1 item had failures:
   1 of  21 in 
sage.quadratic_forms.quadratic_form__equivalence_testing.is_globally_equivalent_to
    [69 tests, 1 failure, 0.27 s]

This error is persistent (i.e. still occurs when the test is run 
standalone) and was not there in 9.2.beta14.
It has also been reported for this release with Ubuntu 20.04 in 
https://groups.google.com/g/sage-release/c/0MnZQYItCYc/m/6ks32lnXAAAJ

Besides, the run of ptestlong generated the same Ubuntu crash reports 
regarding nauty and mwrank as those reported in
https://groups.google.com/g/sage-release/c/6RLsvBKi84I/m/PscGzDefCgAJ

Eric.




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