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x-yuri
Asked: 2017-01-01 13:57:08 +0800 CST

How do I trace back which dependency chain leads to some particular package?

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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?

14.04

1 Answers

  1. 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

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