Save as xlsx file from command line

I have one xlsb file, I could manually open that in libre office and save as xlsx, it works
I want to perform this from command line on linux/ubuntu

any hints?

Put it on a stick and walk to the next Windows PC.
Btw: What is an xlsb file?

Some format to speed up loading, by using binary parts instead of xml. I guess you could google it as well…

Actually never got one…

There is the convert-to option on command line:

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