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I am using dell optiplex 7040 (snap attached)

I have installed the drivers of the scanner it installed successfully after adding multiarch support

after lsusb it shows scanner and after xsane started it shows failed to open device

system information

scaner output

command output

Anil Shinde
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1 Answers1

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Many device access problems are permission problems, and can be resolved through group membership changes.

You can find the device name by watching sudo journalctl --follow as you connect your device. OR ls -1 -l /dev >dev.before, connect the device, wait 10 seconds, ls -1 -l /dev >dev.after;diff dev.{before,after}.

Specifically, if ls -l shows that the group permissions (the second "rwx" triplet) is "rw" (e.g."-rw-rw----"), then, adding oneself to the group that owns the device will grant rw access.

Here's how:

# change to your device name 
device="/dev/YourDevice"
sudo adduser $USER $(stat -c "%G" $device)

This allows you membership in the group that can rw the device, but there is one more step.

To make all your processes members of the new group, logout and login. Group memberships are set up at login time.

To create a single process in the new group (for testing, prior to logout/login):

newgrp $(stat -c "%G" $device)

or, just type the group name. See man newgrp.

waltinator
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