This file is indexed.

/usr/share/cups/templates/error.tmpl is in cups-server-common 2.2.7-1ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<H2 CLASS="title">{?title} {?printer_name} Error</H2>

<P>{?message?{message}:Error}:</P>

<BLOCKQUOTE>{error}</BLOCKQUOTE>