Comment 26 for bug 1899678

The full terminal session is in modprobe.txt but in summary the bcmwl-kernel-source reinstall was simply:

    apt --reinstall install bcmwl-kernel-source

This is a full ISO installation - no extra packages added/nor removed

modinfo wl returns a sig_key signature

The output of the mokutil sed is

dad@dad-HP-Notebook:~$ mokutil --list-enrolled | sed -n -e'/X509v3 Subject Key Identifier:/,/X509v3 Authority Key Identifier:/ { /:..:/p; }'
                7F:BE:DE:09:14:7B:0F:BF:30:0C:8E:50:5C:FF:5F:CE:A2:01:95:67
                BD:AA:86:36:DB:8B:F4:C4:86:12:E4:98:B7:36:03:9E:CD:CB:21:E5
                E8:19:BC:A5:04:AC:51:A2:BC:51:A1:FC:E2:25:FD:69:3F:A6:E6:76
                DF:3B:45:81:83:E2:CD:8F:7E:62:D7:F6:01:6C:76:5A:52:E4:ED:47
                E7:BA:5F:11:7D:D8:E2:A9:D1:48:57:C1:31:2F:2C:78:99:14:B2:B0
                6F:39:87:A1:71:09:A1:F9:6F:81:79:E5:31:5C:0B:24:0A:08:60:05
                2F:08:F0:19:48:E3:1B:19:3E:7A:35:22:A4:48:33:B5:D8:EE:44:B8
                A0:1E:E8:4E:9B:37:AC:E4:07:96:1C:C4:68:C5:90:94:47:87:84:69
                AD:91:99:0B:C2:2A:B1:F5:17:04:8C:23:B6:65:5A:26:8E:34:5A:63
dad@dad-HP-Notebook:~$