For example, openjdk-7-jdk in trusty depends on systemd. How do I figure out dependency chain that leads to systemd? I tried debtree openjdk-7-jdk and apt-rdepends openjdk-7-jdk, but they don't list systemd. What am I doing wrong?
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x-yuri
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The reason I failed was that systemd is pulled in as a recommendation. This way you can see the recommendations as well:
apt-rdepends openjdk-7-jdk --follow Depends,PreDepends,Recommends \
--show Depends,PreDepends,Recommends | grep systemd
The dependency chain is as follows:
http://packages.ubuntu.com/trusty-updates/openjdk-7-jdk
http://packages.ubuntu.com/trusty-updates/openjdk-7-jre
http://packages.ubuntu.com/trusty-updates/libgtk-3-0
http://packages.ubuntu.com/trusty/libcolord1 (recommends colord)
http://packages.ubuntu.com/trusty/colord
http://packages.ubuntu.com/trusty-updates/policykit-1
http://packages.ubuntu.com/trusty-updates/libpam-systemd
http://packages.ubuntu.com/trusty-updates/systemd-services
x-yuri
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apt depends --recurse openjdk-7-jdk, but it will produce tons of output. – Byte Commander Jan 01 '17 at 21:23E: Command line option --recurse is not understood.debtreeandapt-rdependsdon't have such an option. I believe they must recurse by default. – x-yuri Jan 02 '17 at 09:17