Wireshark & Tcpdump not working.

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Hello, first let me say thank you for all those that can help with this issue. I am hoping to solve this issue, for schooling.

So, I am using a Alfa adapter with a Atheros Chipset. and Ubuntu Linux. I have changed to monitor mode with airmon-ng, & attempted in Wireshark and Tcpdump & Snort, a IDPS. Nothing has worked, and in the past when I was younger, I remember there was no problem at all. This issue is on the internet / other forums, and I haven't seen a solution that works.

I am using my home network, and have even gone in to the router and shut off security settings.

Thanks again, for help.