fix quit bug on Ubuntu

lib/main-window.js

@@ -32,22 +32,24 @@ mainWindow.webContents.sendInputEvent({
   keyCode: '\u0008'
 })
 
-mainWindow.on('close', function (e) {
+if (process.platform !== 'linux' || process.env.DESKTOP_SESSION === 'cinnamon') {
-  if (process.platform === 'linux' && process.env.DESKTOP_SESSION !== 'cinnamon') {
+  mainWindow.on('close', function (e) {
+    mainWindow.hide()
+    e.preventDefault()
+  })
+
+  app.on('before-quit', function (e) {
+    mainWindow.removeAllListeners()
+  })
+} else {
+  app.on('window-all-closed', function () {
     app.quit()
-    return true
+  })
-  }
+}
-  mainWindow.hide()
-  e.preventDefault()
-})
 
 app.on('activate', function () {
   if (mainWindow == null) return null
   mainWindow.show()
 })
 
-app.on('before-quit', function (e) {
-  mainWindow.removeAllListeners()
-})
-
 module.exports = mainWindow