Home / ubuntu / Questions / 1148174
In Process
Joe Inwap
Asked: 2019-06-03 15:56:15 +0800 CST

Where does "0 packages can be updated." come from?

  • 772

Where does 0 packages can be updated. come from in the login process?

command-line login

2 Answers

  1. These messages come from update-motd.

    The /etc/update-motd.d/updates-available script generates this specific output from cat /var/lib/update-notifier/updates-available

    • 22

  2. In answer to where do all of the MOTD messages come from, first look at the PAM configs.

     % grep -C1 motd /etc/pam.d/*
 /etc/pam.d/sshd:session optional pam_motd.so motd=/run/motd.dynamic

    Look to see what pam_motd.so runs.

     % strings /lib/x86_64-linux-gnu/security/pam_motd.so
 run-parts /etc/update-motd.d > /run/motd.dynamic.new

    'run-parts' runs all the scripts, in order, in a directory.

     % ls /etc/update-motd.d/
 00-header*     80-esm*  91-release-upgrade*  98-reboot-required*
 10-help-text*  80-livepatch*          95-hwe-eol*
 50-motd-news*  90-updates-available*  98-fsck-at-reboot*

    Helper scripts are in /usr/lib/update-notifier/update-motd*

     /usr/lib/update-notifier/update-motd-fsck-at-reboot*
 /usr/lib/update-notifier/update-motd-hwe-eol*
 /usr/lib/update-notifier/update-motd-reboot-required*
 /usr/lib/update-notifier/update-motd-updates-available*

    Data files are in /var/lib/update-notifier

     dpkg-run-stamp  hwe-eol                  updates-available
 fsck-at-reboot  package-data-downloads/  user.d/

    To output the MOTD info from the command line, either

    $ ssh localhost

    or

    # run-parts /etc/update-motd.d
    • 2