Verdict: Partly
Partly. Excel has no Linux version and Microsoft's system requirements cover only Windows and macOS, but Excel for the web works in a browser on Linux and free suites open .xlsx files.
Microsoft does not make Excel for Linux. The Microsoft 365 home system requirements list Windows and recent macOS versions only. Excel is also the Office app people lean on hardest, so it is worth being careful here rather than optimistic.
Excel for the web covers ordinary household and small business spreadsheets. Formulas, sorting, charts and filters all work in the browser. What it does not do is the heavy end: Power Query, Power Pivot, most add-ins and Visual Basic macros. If your workbook has buttons that run macros, the browser will not run them, and neither will any Linux alternative.
Offline, LibreOffice Calc and ONLYOFFICE both open .xlsx. Everyday formulas convert fine. Conditional formatting, pivot tables and charts usually survive but can look different, and very large workbooks are slower than in Excel.
The practical test takes ten minutes. Open your three most important workbooks in one of these before you wipe Windows, check the numbers at the bottom of each sheet still match, and keep a copy of the originals.
Ribbon layout and strong .xlsx support, including pivot tables. The closest feel to Excel for someone who does not want to relearn anything.
Your files: Opens and saves .xlsx. Visual Basic macros do not run.
Calc is included on Ubuntu and Fedora and handles formulas, charts and pivot tables under its own name of pivot table.
Your files: Opens and saves .xlsx. Has its own macro language, so Excel macros need rewriting.
Spreadsheets module looks very like Excel. Free with ads, and not open source.
Your files: Opens and saves .xlsx with good layout fidelity.
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