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/etc/apt/apt.conf.d/99how-can-i-help is in how-can-i-help 16.

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The actual contents of the file can be viewed below.

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// Tell people how they can help after each package installation

DPkg
{
Post-Invoke {"[ ! -e /usr/bin/how-can-i-help ] || /usr/bin/how-can-i-help --apt";};
};