20.04 no scanning

Hello, I have an HP M277 multi-function connected via network. I can print. I cannot scan. HPLIP 3.20.3 seems to be installed. hp-info, hp-toolbox, hp-setup, hp-scan, all say: error: Unable to locate models.dat file. And: error: No device found that support this feature. XSane find two scanners one via IPv4 an one via IPv6. Choosing either of them gives: Error opening device: opening device ‘escl:http://*.*.*.*:8080’: Out of memory. Can anyone point me in the correct direction how to solve this?

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