/etc/apt/apt.conf.d/05aptitude is in aptitude 0.6.6-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | aptitude::Keep-Unused-Pattern "^linux-image.*$ | ^linux-restricted-modules.*$ | ^linux-ubuntu-modules.*$";
aptitude::Get-Root-Command "sudo:/usr/bin/sudo";
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