Correction.
APT::AutoRemove::RecommendsImportant and APT::AutoRemove::SuggestsImportant are only used by aptitude. apt-get just recycles the values of APT::Install-Recommends and APT::Install-Suggests when deciding which packages should be autoremoved. apt-get's behaviour is also affected by an undocumented and unused option APT::Install-Recommends-Sections that allows autoinstalling/autoremoval of Recommends to be restricted to certain archive sections.
Nevertheless, since APT::Install-Recommends is usually set to true on Ubuntu, the point 2) from my previous comment still applies.
Correction. ::RecommendsImp ortant and APT::AutoRemove ::SuggestsImpor tant are only used by aptitude. apt-get just recycles the values of APT::Install- Recommends and APT::Install- Suggests when deciding which packages should be autoremoved. apt-get's behaviour is also affected by an undocumented and unused option APT::Install- Recommends- Sections that allows autoinstalling/ autoremoval of Recommends to be restricted to certain archive sections.
APT::AutoRemove
Nevertheless, since APT::Install- Recommends is usually set to true on Ubuntu, the point 2) from my previous comment still applies.