I have been using Lightburn 1.1 under Ubuntu 21.10 with no troubles on an Asus Core I7 laptop.
I then upgraded Ubuntu to 22.04 and found that Lightburn could not connect to my Sculpfun S9 laser.
I performed an lsusb command and found the"1a86:7523 QinHeng Electronics CH340 serial converter(found in my Sculpfun) was recognised by Ubuntu. I then performed a dmesg command and found that the CHG340 serial converter had been linked to my Webcam, making it unavailable to Lightburn.
Then I issued the command grep -riIn ā1a86:7523ā /usr/lib/udev/rules.d/*
and this returned the result
/usr/lib/udev/rules.d/85-brltty.rules:330:# Device: 1A86:7523
Ah, that was what was wrong. My 1A86:7523 CHG340 had been claimed as a Braille device.
I commented out the offending line,
ENV{PRODUCT}==ā1a86/7523/*ā, ENV{BRLTTY_BRAILLE_DRIVER}=ābmā, GOTO=ābrltty_usb_runā
But I still wasnāt out of the woods. I still could not access the laser.
Next I added the following line to /usr/lib/udev/rules.d/70-uaccess.rules
SUBSYSTEM==āttyā, ATTRS{idVendor}==ā1a86ā, ATTRS{idProduct}==ā7523ā, GROUP=āusersā, MODE=ā0666ā
after
3D printers, CNC machines, laser cutters, 3D scanners, etc.
I restarted the machine and success. Lightburn can access my Sculpfun S9 from Ubuntu 22.04
I hope this information can be useful to any other Ubuntu user who cannot access his laser after upgrading Ubuntu.
