** Description changed:

  Hi all,
  
  This problem appeared on a freshly installed Ubuntu 22.04 desktop.
  
  When I'm attaching a ftdi device into usb everything looks great but
  there's no /dev/ttyUSB0 file. Looks like it's created and then
  disappears immediately. I tried to remove brltty package (as some
  recommends
  https://bugs.launchpad.net/ubuntu/+source/brltty/+bug/1958224) but it
  didn't help.
  
  The same ftdi device works on older Ubuntu version w/o any problems. So
  hardware is ok.
  
  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.
+ 
+ 
+ Let's take a look in /dev/serial folder:
+ 
+ cd /dev/serial ; ls -LR
+ 
+ .:
+ by-id
+ by-path
+ 
+ ./by-id:
+ ls: cannot access './by-id/usb-FTDI_USB_Serial_FT0KKBIF-if00-port0': No such 
file or directory
+ usb-FTDI_USB_Serial_FT0KKBIF-if00-port0
+ 
+ ./by-path:
+ ls: cannot access './by-path/pci-0000:00:1d.0-usb-0:1.5:1.0-port0': No such 
file or directory
+ pci-0000:00:1d.0-usb-0:1.5:1.0-port0
+ 
+ So the folders and links are there but there's no /dev/ttyUSB0 file the
+ links point to.

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https://bugs.launchpad.net/bugs/1976534

Title:
  /dev/ttyUSB0 doesn't appear for an FTDI on fresh Ubuntu 22.04

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