Comment 2 for bug 1891958

Unpacking nmap-common (7.80+dfsg1-2build1) ...
dpkg: error processing archive /var/cache/apt/archives/nmap-common_7.80+dfsg1-2build1_all.deb (--unpack):
 trying to overwrite '/usr/share/nmap/nmap-mac-prefixes', which is also in package nmap 7.80-2

Where did you get 7.80-2 package from ? It does not look like you got it from Ubuntu repositories:

$ cat debian/changelog | grep 7.80
nmap (7.80+dfsg1-2build1) focal; urgency=medium
nmap (7.80+dfsg1-2) unstable; urgency=medium
nmap (7.80+dfsg1-1) unstable; urgency=medium

It seems that you are not using a software package provided by the official Ubuntu repositories. Because of this the Ubuntu project can not support or fix your particular bug. Please report this bug to the provider of the
software package. Thanks!