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.
--
requires user interaction on installation
https://bugs.launchpad.net/bugs/241700
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