No space left on device ...

[Albretch Mueller <lbrtchx@gmail.com>]

I have been mounting an NTFS file system on a Windows laptop without
any problems whatsoever with a Debian Live DVD:

$ uname -a
Linux debian 5.10.0-18-amd64 #1 SMP Debian 5.10.140-1 (2022-09-02)
x86_64 GNU/Linux

and even though Linux utilities are telling me I do have space on the drive:

$ date; sudo df -h | grep "Filesystem\|/dev/sd"
Sun 14 May 2023 06:55:23 PM UTC
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       286G  167G  120G  59% /media/user/60320G593EB7250F
$

$ date; time sudo du --summarize --human-readable  /media/user/60320G593EB7250F
Sun 14 May 2023 07:13:43 PM UTC
166G	/media/user/60320G593EB7250F

real	0m45.230s
user	0m1.073s
sys	0m15.443s
$

when I try to save or download a file I consistently get the same error message:

$ cp "No space left on device" > No_space_left_on_device.txt
bash: No_space_left_on_device.txt: No space left on device

that started happening right after a WiFi connection at a library was
shutdown, which I waited for with my script running, accessing the
Internet, because I wanted to test such a case. Script "gracefully"
worked as programmed to do, but that other error started right after
the connection was cut off.

I have no idea how could those two things be related! Why would that
happen? Any suggestions, please?

lbrtchx