LibreOffice
Different way of workingFreeCalc handles pivot tables and charts from a spreadsheet. Fine for a monthly summary, nowhere near Power BI for modelling data.
Your files: Opens .xlsx and CSV exports. It cannot open a .pbix report file.
Verdict: Partly
Partly. Power BI Desktop needs Windows 10 or later and has no Linux version, so building reports is what you lose. Viewing and sharing published reports works in a browser.
Microsoft lists Windows 10 or Windows Server 2016 and later as the minimum for Power BI Desktop, along with a Windows framework and the Edge browser engine. There is no Mac version and no Linux version, and the program is only distributed through the Microsoft Store or as a Windows installer.
The half that does work on Linux is the Power BI service. Sign in at the Power BI website in Firefox or Chrome and you can open reports and dashboards someone has published, filter them, drill into them, subscribe to them and share them. If your job is reading reports rather than making them, very little changes.
Authoring is the part that stops. Connecting to data sources, shaping data, writing measures and designing report pages all happen in Power BI Desktop, and a .pbix file cannot be opened anywhere else. The service can create simple reports from data already in it, but it is not a substitute for the desktop program.
If you have to author, the honest answers are a Windows machine, a Windows virtual machine on your Linux computer, or one of Microsoft's hosted Windows desktops, which Microsoft supports for this. None of those are free.
Calc handles pivot tables and charts from a spreadsheet. Fine for a monthly summary, nowhere near Power BI for modelling data.
Your files: Opens .xlsx and CSV exports. It cannot open a .pbix report file.
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