I can confirm that nmap version 7.80+dfsg1-2ubuntu0.1 from proposed (from ubuntu-ports on a Raspberry Pi) works now where-as before the upgrade I was getting the above error.
I can confirm that nmap version 7.80+dfsg1- 2ubuntu0. 1 from proposed (from ubuntu-ports on a Raspberry Pi) works now where-as before the upgrade I was getting the above error.