How do I get rid of "soffice.bin wants to install fonts"?

When I click on a cell and then ‘Format Cells …’ in calc, and then click : a box appears with the above message plus “Additional fonts are required to view this document correctly >> Central Khmer, Burmese. Do you want to search for suitable packages now?”.

I click Cancel to remove the box and continue operating the spreadsheet.

Why does this happen?

I am still waiting for an answer!! Five and a half months later . . . . . . .

I asked the same question with still without answer How to stop definitively in calc window "soffice.bin wants to install fonts"