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Epson MFP EP-977A3 and Linux box

Just a report of a hardware device usage for reminder. 
 EPSON EP-977A3 is a multi-functional peripheral for personal use once sold in Japanese market. 
 It has color printer, color flat-bed scanner, USB memory RW capability with USB and both wired and wireless LAN connectivity. 
With the simple-scan software, whose package name is 'simple-scan' in Debian 10, I am able to scan documents from the flat-bed scanner of EPSON EP-977A3 connecting with my Debian box with an USB cable. 
 But when I tried to start scanning on the control panel of the scanner device, I got error with a message saying "The computer is not ready". I guessed if the scanned package for that purpose and installed it. Still, I got the same error message. Hmm... I need more research.

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