File privileges problem on USB thumbdrive

[Bret Busby]

On 17/08/2020, Robert Heller <heller at deepsoft.com> wrote:
> At Mon, 17 Aug 2020 06:15:27 +0800 "Ubuntu user technical support,  not for
> general discussions" <ubuntu-users at lists.ubuntu.com> wrote:
>
>>
>> On 17/08/2020, Colin Law <clanlaw at gmail.com> wrote:
>> > On Sun, 16 Aug 2020 at 20:10, Bret Busby <bret.busby at gmail.com> wrote:
>> >>
>> >> Hello.
>> >>
>> >> This applies equally to UbuntuMATE 20.04.x and 16.04.x .
>> >>
>> >> I have a USB thumbdrive, which is formatted as FAT32.
>> >>
>> >> I want to move the files written to it, to another medium, so as to
>> >> reuse the thumbdrive for writing.
>> >>
>> >> I have previously done this, with this thumbdrive, and, with other
>> >> thumbdrives of the same model, capacity (128GB), and manufacturer.
>> >>
>> >> However, now, whilst file managers (caja and PCmanFM) show me, as the
>> >> owner of the files, with Read and write folder access, no file access
>> >> privilege is shown in the caja file manager, and, I can not use cut
>> >> (and thence paste to another destination) or rename functionality on
>> >> the files, and, trying to use chmod 777 and sudo chmod 777 , both
>> >> return the error "file system is read only".
>> >>
>> >> ls  -l shows
>> >> -rw -r--r--
>> >> for the files.
>> >>
>> >> As I am supposed to be able, as the shown owner of the files, both
>> >> read and write to, the files, why does the operating system designate
>> >> them as read-only, and, how do I overcome this?
>> >
>> > Apologies in advance, but I have to ask whether you have checked that
>> > the write protect switch on the drive (if there is one) is in the
>> > correct state?
>> >
>> > Otherwise are you able to write to it on a Windows system?  It is
>> > possible that it is broken.
>> >
>> > It might be worth watching the log while you plug it in, it might
>> > indicate why it is read only.
>> > sudo journalctl -f
>> > or
>> > sudo tail -f /var/log/syslog
>> >
>> > Colin
>> >
>> > --
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>> > https://lists.ubuntu.com/mailman/listinfo/ubuntu-users
>> >
>>
>> I have tried repeatedly to send responses from the 20.04 computer in
>> which the thumbdrive is located, and every message (four so far)
>> disappeared when I clicked the send button. gmail tells me that each
>> message is sent, but, each disappears without a trace, even with using
>> a BCC back to me. gmail is eating my email.
>
> All four messages went out on the list.
>
> It is a *feature* of GMail (not a bug) that when you send a message to a
> mailing list GMail hides/discards the copy that comes back to you.  It is a
> feature not a bug.  You could complain to Google, but good luck with that.
>
>>
>
> --
> Robert Heller             -- Cell: 413-658-7953 GV: 978-633-5364
> Deepwoods Software        -- Custom Software Services
> http://www.deepsoft.com/  -- Linux Administration Services
> heller at deepsoft.com       -- Webhosting Services
>
>

On the 20.04 computer, with using BCC to get a copy sent back to me,
when I clicked the button, each message completely disappeared. I did
not even get a copy in my gmail Sent Mail folder.

When I sent my message above, advising that the messages had (insofar
as I am aware) disappeared without trace, from my 16.04 computer, I
got a copy of that, both in my Sent Mail folder, and in my folder for
messages to and from the mailing list.

There are two variables in play, in this problem; the first is that
the messages that I do not have a copy of, that I sent, were sent from
UbuntuMATE 20.04.x, and, the messages that I sent, of which I have a
copy, were sent from UbuntuMATE 16.04.x, and, the second variable in
play, is that the messages that I do not have a copy of, that I sent,
were sent using, as the web browser, the latest version (from the
Ubuntu repository) of Firefox, and, the messages that I sent, of which
I have a copy, were sent using, as the web browser, midori 0.5.11 .

So, I assume that, as it works with midori 0.5.11 running on
UbuntuMATE 16.04.x , but, not with the latest version of Firefox for
and running on UbuntuMATE 20.04, that it is something to do with the
platform.

Anyway, if the multiple response attempts did get through to the list,
I apologise for the multiplicity - I was just trying to get a response
through, and they each seemed to be simply disappearing.

-- 
Bret Busby
Armadale
West Australia
..............