My system is:
- HP LaserJet MFP m236dw
- Ubuntu 18.04
- HPLIP ver. 3.21.8
hp-scan gives gray picture up to 300 dpi with no problems.
However, in color mode "hp-scan -m color" it gives the following error:
Warming up...
Scanning...
error: SANE: Error during device I/O (code=9)
Closing device.
Doesn't matter if USB or Network connection.
I've tried all solutions I could find on the Internet.
I tried several HPLIP versions with complete cleanup&reinstall and at some point it gave me 300 dpi color picture, but after reboot it stopped working again and I failed to reproduce the conditions that caused it to work once.
hp-check and hp-doctor see no problems.
Printing works OK.
Any help is appreciated....
