Not great during upgrades.
Setting up anon-base-files (3:3.6-1) ...
Configuration file '/etc/machine-id'
==> File on system created by you or by a script.
==> File also in package provided by package maintainer.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** machine-id (Y/I/N/O/D/Z) [default=N] ?
Can we avoid this interactive dpkg conflict resolution dialog? Somehow preseed saying