After updating fastai library all dl1 notebooks are truncated

After updating fastai library all dl1 notebooks are truncated. “Notebook failed to load. The error was: “[sprintf] expecting number but found string” See error console for details.”

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Try “conda upgrade notebook”. When I moved to version 5.7 I no longer get that error.

I’ve got the very same error in swift notebooks on docker.
See “caveats” I found the solution in old @stas post: