LibreOfice calc - sort grayed-out

I'm using LibreOffice I've opened a csv file. I want to sort. Data > Sort is grayed-out. Why?
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Dave BaldwinFixer of ProblemsCommented:
Don't know.  Can you post the CSV file so we can examine it?
MarkAuthor Commented:
Here's a clue I didn't notice before. At the top of the spreadsheet it says "Read Only". In fact, I can't change anything in the cells.

The CSV file was opened from the web. I'm using Libre Calc on Ubuntu. When I open this same CSV file in Excel on Windows I can make changes.

Is this a "feature" of Libre Calc? Is there a way to make it not read only? I'm evaluating LibreOffice as a replacement for MS Office in our office. Many intranet programs create CSV files on the fly. This will be a big issue if such files can't be manipulated.
First, if you are evaluating LibreOffice, you should do that wi a newer version, like Version 5, which would be the current version, and not an outdated one. I suggest trying the portable version, which has the same features as the installed version has, but you don't need installation, and updates are managed via the PortableApps tool:

And, yesthat is a feature of LibreOffice. You must download the file to your PC so that it is editable. Or click on "Edit Document", then select something in the document, after that you should get "sort" ungreyed.

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MarkAuthor Commented:
you should do that wi[th] a newer version, like Version 5 ...
I'm using Ubuntu which I keep up-to-date. Perhaps the LibreOffice suite doesn't get updated, or perhaps the latest has not made it into to the Ubuntu repository.
... yes that is a feature of LibreOffice. ... click on "Edit Document"
I did find that "Edit" button, but is there no way for that to be a default? Trying to pry MS Office out of the hands of users in favor of LibreOffice is challenge enough. The extra step will make them grumble.
Dave BaldwinFixer of ProblemsCommented:
MS Office doesn't run on Linux.  Ubuntu versions of programs tend to be stuck at the version that came with that version of Ubuntu.  

It says 'Read Only' because it has been opened from 'temp' folder.  All you have to do to remove the 'Read Only' (which occurs on Windows also) is to save it to a location where the user has read/write permissions.
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