/etc/aptitude-robot/options.d/10-remove-level-maximum is in aptitude-robot 1.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # Tell aptitude's resolver that we prefer updating, installing or
# keeping packages over removing them.
#
# See http://aptitude.alioth.debian.org/doc/en/ch02s03s05.html#secDependencyResolutionHints
-o Aptitude::ProblemResolver::Remove-Level=maximum
-o Aptitude::ProblemResolver::Hints::=reject !~M :UNINST
|