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Thanks so much for your help! I tried changing the LyX settings, but that didn't work. In the end, I marked the opening text as "English, UK" rather than the default "English".

That generated a line in the LaTeX preamble which reads:

\usepackage[british,french,german,english]{babel}

replacing ...

Hello,

I'm writing my PhD thesis in LyX. I recently installed Ubuntu on my computer, and opened my LyX document, previously created in LyX with MikTeX and Windows, on the Ubuntu computer. When compiling the .pdf document, suddenly the headings, (contents, chapters, etc.) are in French instead of ...