I have an HP USB LaserJet MFP printer/scanner M125a. I installed the printer using hp-update and it works. For scanning I tried to use simple-scan. It opens the GUI and finds the scanner. However when I click the "scan" button it says "Unable to connect to scanner". Tried both as root and user.
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hplip-gui
and runhp-plugin
– N0rbert Jun 12 '20 at 19:37