I suspect your problem is the proposed pin priority 400: 400 http://ports.ubuntu.com/ubuntu-ports kinetic-proposed/main arm64 Packages
Do you have any files /etc/apt/preferences and/or /etc/apt/preferences.d/*?
I suspect your problem is the proposed pin priority 400: ports.ubuntu. com/ubuntu- ports kinetic- proposed/ main arm64 Packages
400 http://
Do you have any files /etc/apt/ preferences and/or /etc/apt/ preferences. d/*?