7.6.1 Overwriting files in other packages

It is usually an error for a package to contain files which are on the
system in another package. However, if the overwriting package declares
that it Replaces the one containing the file being overwritten, then
dpkg will replace the file from the old package with that from the new.
The file will no longer be listed as "owned" by the old package and will
be taken over by the new package. Normally, Breaks should be used in
conjunction with Replaces.[53]

For example, if a package foo is split into foo and foo-data starting at
version 1.2-3, foo-data would have the fields

     Replaces: foo (<< 1.2-3)
     Breaks: foo (<< 1.2-3)

in its control file. The new version of the package foo would normally
have the field

     Depends: foo-data (>= 1.2-3)

(or possibly Recommends or even Suggests if the files moved into foo-
data are not required for normal operation)


Ref:
https://www.debian.org/doc/debian-policy/ch-relationships.html

rbasak, what do you think of this ^^ ?

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https://bugs.launchpad.net/bugs/1176046

Title:
  isc-dhcp dhclient listens on extra random ports

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