Verdict: Partly
Partly. Notion does not make a Linux desktop app, but the full Notion workspace runs in Firefox or Chrome and nothing in your account changes.
Notion publishes desktop apps for Windows and Mac only. There is no Linux download on its site, and Notion has never shipped one.
That matters less than it sounds, because the desktop app is essentially the website in its own window. Sign in at notion.so in Firefox or Chrome and you get your pages, databases, teamspaces and sharing exactly as before. Most people who switch report that the only things they miss are the global keyboard shortcut and having Notion in the taskbar, and both can be patched over by pinning the tab or installing Notion as a web app from your browser's menu.
What you do lose is proper offline use. The Windows app caches recent pages. A browser tab does not do that reliably, so a page you have not opened lately may not be there without a connection.
Your workspace, subscription and files are untouched by the move. Nothing is stored on the Windows PC that you need to rescue. If you want something local instead, Logseq and Obsidian both keep notes as plain files on your own drive.
Proper Linux app with linked pages and a plugin for almost anything. No shared team databases, and notes live as files on your computer.
Your files: Notion can export a workspace as Markdown, which Obsidian reads. Databases come across as tables and lose their views.
Free and open source, with linked pages and a daily journal. Everything is written as bullet points, which takes a little getting used to.
Your files: Reads Markdown files, so a Notion Markdown export can be dropped straight into a folder.
Straightforward notebooks and notes rather than a workspace. Better if you mostly wrote long pages and rarely used databases.
Your files: Imports Markdown files, including a Notion export. No equivalent to Notion databases.
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