Comment 2 for bug 241700

This is a result of the following line in the postinst script:

  lpadmin -h localhost -p $queue -E -v cups-pdf:/ -m lsb/usr/cups-pdf/PostscriptColor.ppd -o printer-is-shared=no -o PageSize=$size 2>/dev/null || :

From the lpadmin manpage:

  COMPATIBILITY
    Unlike the System V printing system, CUPS allows printer names to contain any printable character except
    SPACE, TAB, "/", or "#". Also, printer and class names are not case-sensitive. Finally, the CUPS version
    of lpadmin may ask the user for an access password depending on the printing system configuration. This
    differs from the System V version which requires the root user to execute this command.

What a bummer.

If lpadmin requires interaction under certain circumstances, we either need to avoid those circumstances in maintainer scripts, or not use it in maintainer scripts.