I'm trying to install python 3.9.2 on a 18.04.5 ubuntu. I downloaded the Python-3.9.2.tar.xz and followed the readme.txt installation instructions. When executing the "make test" command I get this error : 

== Tests result: FAILURE then FAILURE ==

397 tests OK.

2 tests failed:
    test_embed test_tabnanny

26 tests skipped:
    test_bz2 test_dbm_gnu test_dbm_ndbm test_devpoll test_idle
    test_ioctl test_kqueue test_lzma test_msilib test_ossaudiodev
    test_readline test_smtpnet test_sqlite test_ssl test_startfile
    test_tcl test_tix test_tk test_ttk_guionly test_ttk_textonly
    test_turtle test_winconsoleio test_winreg test_winsound
    test_zipfile64 test_zoneinfo

2 re-run tests:
    test_embed test_tabnanny

Total duration: 9 min 26 sec
Tests result: FAILURE then FAILURE
Récolte du processus fils perdant 0x55e48cc2b400 PID 15880 
Makefile:1199: recipe for target 'test' failed
make: *** [test] Error 2
Retrait du processus fils 0x55e48cc2b400 PID 15880 de la chaîne.

I don't know what to do. I've read one issue on the topic but I have to admit that I didn't understand a thing. Here's the issue https://bugs.python.org/issue43001

Thank you for your answers.