Open Synaptic and search for HPLIP
Install HPLIP and HPLIP-GUI
Search for HP Toolbox in the menu under Preferences. Open it
Setup your Scanner/Printer in the HP Toolbox
*you may have to manually enter the ip address of you scanner/printer on your network. it is found by pressing the wifi button on your device
*you may have to manually add yourself to the group lpadmin. install gnome-system-tools and restart your desktop. look for users and groups, under the preferences menu. click on lpadmin and then preferences enter admin password and click on your user and you are done.
Press the SCAN button
Simple Scan will open with your Scanner/Printer listed by default
This will work for your network setups.
This even works on my laptop with my network setup, where simple scan wanted to scan my webcam.
It's that easy once you know