Failed to execute child process "htmlview"
解决：
ln -s epiphany /usr/local/bin/htmlview
When I type http://localhost:631 in the browser, I get the following:
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Failed to Connect
Firefox can't establish a connection to the server at localhost:631.
Though the site seems valid, the browser was unable to establish a connection.
* Could the site be temporarily unavailable? Try again later.
* Are you unable to browse other sites? Check the computer's network connection.
* Is your computer or network protected by a firewall or proxy? Incorrect settings can interfere with Web browsing.
Try Again
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安装firestarter 打开端口631 （策略，应用策略）
http://kubuntuforums.net/forums/index.php?action=printpage;topic=3100392.0