When I tried to open an EXCEL file using LibreOffice, I posted the following error: When using Office, files can be opened normally. But Office is not stable under Zorins OS. Ask for help in finding a way to open a file with LibreOffice
ZORINS OS rookie
Maybe it’s a corruption in the file you’re trying to open? I opened a sample .xlsx from here https://file-examples.com/index.php/sample-documents-download/sample-xls-download/ and it opened fine for me. Can you try with different files?
Was the file type .xls or .xlsx? Maybe convert it to a .csv if you still have Excel available to you.