/dev/ttyUSB0 file disappears on Ubuntu 22.04

TonicLab.ru
2022-06-01T16:44:55Z

Hi all,

This problem appeared on a freshly installed Ubuntu 22.04 desktop. Not
sure I need to post this here.

When I'm attaching a ftdi device into usb everything looks great but
there's no /dev/ttyUSB0 file. Seems it created and then disappeared. I
tried to remove brltty package (as some recommends on the net) but it
didn't help. The same ftdi device works on older Ubuntu version w/o any
problems.

I'm having this in syslog:
Jun 1 16:58:09 qgs-comp kernel: [ 538.642086] usb 2-1.5: new
full-speed USB device number 5 using ehci-pci
Jun 1 16:58:10 qgs-comp kernel: [ 538.756437] usb 2-1.5: New USB
device found, idVendor=0403, idProduct=6001, bcdDevice= 6.00
Jun 1 16:58:10 qgs-comp kernel: [ 538.756445] usb 2-1.5: New USB
device strings: Mfr=1, Product=2, SerialNumber=3
Jun 1 16:58:10 qgs-comp kernel: [ 538.756448] usb 2-1.5: Product: USB
Serial
Jun 1 16:58:10 qgs-comp kernel: [ 538.756450] usb 2-1.5: Manufacturer:
FTDI
Jun 1 16:58:10 qgs-comp kernel: [ 538.756452] usb 2-1.5: SerialNumber:
FT0KKBIF
Jun 1 16:58:10 qgs-comp kernel: [ 538.759677] ftdi_sio 2-1.5:1.0: FTDI
USB Serial Device converter detected
Jun 1 16:58:10 qgs-comp kernel: [ 538.759713] usb 2-1.5: Detected
FT232RL
Jun 1 16:58:10 qgs-comp kernel: [ 538.760546] usb 2-1.5: FTDI USB
Serial Device converter now attached to ttyUSB0
Jun 1 16:58:01 qgs-comp colord-sane: message repeated 2 times: [
io/hpmud/musb.c 2101: Invalid usb_open: Permission denied]
Jun 1 16:58:10 qgs-comp mtp-probe: checking bus 2, device 5:
"/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5"
Jun 1 16:58:10 qgs-comp mtp-probe: bus: 2, device: 5 was not an MTP
device
Jun 1 16:58:10 qgs-comp systemd-udevd[5394]: 2-1.5: Failed to
create/update device symlink '/dev/ttyUSB0', ignoring: File exists
Jun 1 16:58:10 qgs-comp snapd[942]: hotplug.go:199: hotplug device add
event ignored, enable experimental.hotplug
Jun 1 16:58:10 qgs-comp mtp-probe: checking bus 2, device 5:
"/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5"
Jun 1 16:58:10 qgs-comp mtp-probe: bus: 2, device: 5 was not an MTP
device
Jun 1 16:58:10 qgs-comp colord-sane: io/hpmud/musb.c 2101: Invalid
usb_open: Permission denied

I noticed this line:

Jun 1 16:58:10 qgs-comp systemd-udevd[5394]: 2-1.5: Failed to
create/update device symlink '/dev/ttyUSB0', ignoring: File exists

Why is it happening? There's no /dev/ttyUSB0 neither before nor after I
attach ftdi device to a USB port.

thanks