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diff --git a/apps/desktop/build/icons/512x512.png b/apps/desktop/build/icons/512x512.png
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diff --git a/apps/desktop/build/icons/64x64.png b/apps/desktop/build/icons/64x64.png
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diff --git a/apps/desktop/electron-builder.yml b/apps/desktop/electron-builder.yml
index cc0d8ba320..f0a0c0f565 100644
--- a/apps/desktop/electron-builder.yml
+++ b/apps/desktop/electron-builder.yml
@@ -46,20 +46,31 @@ linux:
   # Yaru). Forcing `multica` makes every Linux identity slot agree and
   # matches `StartupWMClass=Multica` (productName-derived).
   executableName: multica
-  # Pin StartupWMClass explicitly to the WM_CLASS that Electron emits on
-  # X11. Electron derives WM_CLASS from `app.getName()`, which in packaged
-  # builds resolves to `productName` (`Multica`). Without an explicit
-  # `StartupWMClass`, electron-builder writes `productName` as the default
-  # — making this declaration redundant with current settings — but
-  # pinning the value here turns a silent future drift (e.g. if anyone
-  # renames productName or sets app.setName at boot) into a visible diff
-  # against this file. The WM_CLASS ↔ StartupWMClass match is what lets
-  # GNOME associate the running window with the `.desktop` entry and
-  # therefore render the right icon. The post-build verification step in
-  # PR #2437 is `xprop WM_CLASS` on a real Ubuntu install.
+  # Pin StartupWMClass to the WM_CLASS Electron emits on X11. Electron
+  # derives WM_CLASS from `app.getName()`, which reads the *packaged*
+  # ASAR's `package.json` — `productName` if present, otherwise `name`.
+  # PR #2437 assumed electron-builder.yml's productName fed app.getName()
+  # directly; it does not. With our source package.json carrying only
+  # `name: "@multica/desktop"`, packaged Electron emitted
+  # `WM_CLASS=@multica/desktop`, which broke association with this entry
+  # and reproduced #2515 on Ubuntu 0.2.31. The fix lives in two places
+  # outside this file — `productName: "Multica"` on the source
+  # package.json (so the ASAR carries it) and `app.setName("Multica")`
+  # in the production branch of `src/main/index.ts` (belt-and-braces).
+  # Keep `StartupWMClass: Multica` pinned here so any future drift in
+  # those two anchors shows up as a diff against this declaration.
+  # Verification on a real Ubuntu install: `xprop WM_CLASS` on a running
+  # window prints `Multica` for both fields.
   desktop:
     entry:
       StartupWMClass: Multica
+  # Point at pre-rendered hicolor sizes. electron-builder *can* generate
+  # 16/24/32/48/64/128/256/512 from a single build/icon.png, but the
+  # auto-generation silently shipped only the 1024×1024 source in our
+  # v0.2.31 .deb (#2515 reproduces this) — leaving GNOME's hicolor lookup
+  # with no usable size and falling back to the theme default. Shipping
+  # the sizes from source removes the toolchain dependency entirely.
+  icon: build/icons
   target:
     - AppImage
     - deb
diff --git a/apps/desktop/package.json b/apps/desktop/package.json
index d41b6cc90f..2be7267a30 100644
--- a/apps/desktop/package.json
+++ b/apps/desktop/package.json
@@ -1,5 +1,6 @@
 {
   "name": "@multica/desktop",
+  "productName": "Multica",
   "version": "0.1.0",
   "private": true,
   "description": "Multica Desktop — native desktop client for the Multica platform.",
diff --git a/apps/desktop/src/main/index.ts b/apps/desktop/src/main/index.ts
index 8c278b49bc..dc5173f63b 100644
--- a/apps/desktop/src/main/index.ts
+++ b/apps/desktop/src/main/index.ts
@@ -212,6 +212,14 @@ const DEV_APP_NAME = process.env.DESKTOP_APP_SUFFIX
 if (is.dev) {
   app.setName(DEV_APP_NAME);
   app.setPath("userData", join(app.getPath("appData"), DEV_APP_NAME));
+} else {
+  // Pin the production app name in code. Electron's Linux WM_CLASS is set
+  // from app.getName() when the first BrowserWindow is realized; the
+  // packaged ASAR's package.json `productName` already steers app.getName()
+  // to "Multica", but anchoring it here makes WM_CLASS ↔ StartupWMClass
+  // (declared in electron-builder.yml) survive a regression in
+  // productName / the build pipeline. Must run before requestSingleInstanceLock().
+  app.setName("Multica");
 }
 
 // --- Protocol registration -----------------------------------------------