i have found, with " site:https://bugs.debian.org/ wake black " and " site:https://lists.debian.org/debian-user/ wake black " in google, some other bugs that may be related: 680586, 773913, 882027, 886302. and also some mailing list discussions: https://lists.debian.org/debian-user/2015/09/msg00145.html , https://lists.debian.org/debian-user/2018/09/msg00033.html .