[Permission problem] I'm wondering if I set the USB permission correctly?

[stdebob]

So, I'm reading the Wiki, and found out that sufficient permission is required to print. (I suspect I don't have sufficient permission so it just stucks on Processing - cfFilterChain: ghostscript (PID 3712) exited with no errors.)

Also recall that we have set the device permission to "0666" in udev, which means read and write for all users. Verify that fact by listing the device file:

$ ls -l /dev/bus/usb/001/008
crw-rw-rw-. 1 root lp 007, 20 Mar 20 00:00 /dev/bus/usb/001/008 

Here's my output

$ ls -l /dev/bus/usb/001/002
crw-rw-rw- 1 root users 189, 1 10:28 26 Thg 4  /dev/bus/usb/001/002

• First, taking a look at permission, I think it looks the same. But if I notice correctly, the fullstop is at the end of the permission, which makes me wondering if this is actually required, or not.
• Second, the user doesn't seems to be correct. It said users 189 instead of what I'm expecting: lp 007

My system: EndeavourOS 25.4-1

[stdebob]

I just noticed that the printer connection is gone after I tried to print: direct usb://Canon/LBP2900?serial=0000C1E1E3Y4

Step to reproduce:

1. Connect printer while it's off
2. Turn on printer
3. Restart CUPS
4. lpinfo -v displaying my printer
5. lsusb displaying my printer
6. Try printing in any apps
7. Stuck at Processing - cfFilterChain: ghostscript (PID 3712) exited with no errors.
8. lpinfo -v doesn't display my printer
9. lsusb still displaying the printer

I hope these information would be useful.