Do not fail in upgrade mode (-u) when configuration files have been modified
Custom configuration files might be present and upgrading
packages might fail then:
| Setting up sudo (1.8.9p5-1) ...
|
| Configuration file '/etc/sudoers'
| ==> 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.
| *** sudoers (Y/I/N/O/D/Z) [default=N] ? dpkg: error processing package sudo (--configure):