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Date:   Sat, 04 Jun 2022 08:31:56 +0300
From:   Yuri <info@toniclab.ru>
To:     Greg KH <greg@kroah.com>
Cc:     linux-usb@vger.kernel.org
Subject: Re: /dev/ttyUSB0 file disappears on Ubuntu 22.04
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>> 
>> ls: cannot access '/dev/ttyUSB*': No such file or directory
> 
> Is the device node actually there?
> 
> What does /dev/serial/ contain?
> 

After I have a ftdi device attached I have

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

>> No problems on the same PC working under Ubuntu 18.04 and 16.04 
>> whatsoever:
>> 
>> ls -l /dev/ttyUSB*
>> crw-rw---- 1 root dialout 188, 0 Jun  2 10:36 /dev/ttyUSB0
> 
> I think you are going to have to contact ubuntu for this issue and get
> support from them as it's their kernel and overall system configuration
> here, the kernel looks like it is working just fine.

Thanks for advice. Already opened a bug report on launchpad.