What did you do with the udev rules?
I put them into /etc/udev/rules.d/49-teensyrules
Could you please look at the following lines out of Arduino prefernces.txt ? Looks quite different to a working installation I have.
serial.databits=8
serial.debug_rate=9600
serial.line_ending=1
serial.parity=N
serial.port=/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4
serial.port.file=/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4
serial.port.iserial=null
serial.port.label=/dev/bus/usb/002/025 (Teensy 3.6) Bootloader
serial.port.protocol=Teensy
serial.stopbits=1
I put them into /etc/udev/rules.d/49-teensyrules
Could you please look at the following lines out of Arduino prefernces.txt ? Looks quite different to a working installation I have.
serial.databits=8
serial.debug_rate=9600
serial.line_ending=1
serial.parity=N
serial.port=/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4
serial.port.file=/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4
serial.port.iserial=null
serial.port.label=/dev/bus/usb/002/025 (Teensy 3.6) Bootloader
serial.port.protocol=Teensy
serial.stopbits=1