[libreoffice-users] Error saving the document ...

Writer document of a little over one page that has been saved
repeatedly without a problem as I created it over the past two days. It
is almost finished, and suddenly I got:

Error saving the document <filename>:
Write Error.
Error in writing sub-document content.xml.

I also tried Save As, but get the same error message. 

Then I did Select All (Ctrl-a) intending to copy it all and paste it
into a new document. Writer locked up, and a few moments later Xubuntu
popped up a Crash Report Detected message. And then the Writer window
disappeared from the screen.

I re-launched Writer and got the recovery screen. I clicked on Start
Recovery and it recovered the document, sans the last half hour of
work. I typed a couple characters and saved it again without issue, so
apparently the recovered document is saving fine now.

I have used OOo and LO since about 2000, and I have never had a
crash before. This is version 3.5.7.2 that came with Xubuntu. 

The document in question is just text, about half in tables. Some
cells are in Greek and some in English. 

Can someone translate the above error message for me? What might have
caused it? 

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