This is not the case for Slack. All the cli tools from cups-bsd are already included in the Slack cups package.
It's not that Okular can't communicate with cups, it does send the document to be printed. However, cups is unable to understand the required filter of any document sent by Okular. I haven't dug into the issue because I have other options to print the document. But before I start picking things apart, I wanted to know if this is an isolated incident or a known Slack problem.
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