That error you are seeing appears to come from your USB to Serial interface.
Note:
http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=225&pcid=41

Jon

On Tue, Jul 21, 2020 at 6:48 AM <[email protected]> wrote:

> I got to know that the driver is no longer supported when I first
> connected the cable. The driver still seems to work though.
>
>
> [image: PL2303HXA-driver-properties.png]
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> Also, I added filters in the VM's settings and that is how picocom was
> able to connect to /dev/ttyUSB0.
>
>
> On Monday, July 20, 2020 at 2:51:55 AM UTC+2, Dennis Bieber wrote:
>
>> On Sun, 19 Jul 2020 12:15:09 -0700 (PDT), in
>> gmane.comp.hardware.beagleboard.user Rishabh
>> <[email protected]> wrote:
>>
>> >I am running Ubuntu 18.04 inside a VM using VirtualBox hosted on Windows
>> >10. I am trying to use a PL2303HXA serial to USB cable to get the serial
>> >output to my terminal in Ubuntu. I am doing this to view U-Boot.
>> >
>>
>>         Wonder if Win10 may be getting in the way... The driver for the
>> HXA is
>> no longer supported in Win10.
>> http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=225&pcid=41
>> """
>>  NOTE:
>>
>>     Windows 8/8.1/10 are NOT supported in PL-2303HXA and PL-2303X EOL
>> chip
>> versions.
>> """
>>
>>         I don't know how VirtualBox handles USB devices -- if they pass
>> through
>> to the guest OS as raw devices, or if VBox is intercepting the guest I/O
>> and mapping through the host OS...
>>
>> https://www.google.com/search?q=PL2303HXA+&oq=PL2303HXA
>>
>>
>> --
>> Dennis L Bieber
>>
>>
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