Short:

Setup application (hp-setup) in package hplip fails miserably, after specifying network settings (SSID, WPA key) printer cannot connect network. Troubleshooting & printing the configuration (press Cancel button on the printer), found out that WPA-PSK didn’t get saved on the printer.

Resolution: Install printer w/ hp-setup, but connect it to OPEN WiFi network. After that, you can connect to printer via HTTP, and configure wireless network again. Win.

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