Docker Desktop Bug Fixes and Improvements

* Fixed an issue where attempts to upgrade Docker Desktop to version 2.1.0.0 sometimes failed with the error `value cannot be null`. [docker/for-win#4343](https://github.com/docker/for-win/issues/4343) * Fixed an issue that caused the installer to hang when upgrading Docker Desktop to version 2.1.0.0. [docker/for-win#4387](https://github.com/docker/for-win/issues/4387) * Improved the error messages displayed during VM lifecycle operations. [docker/for-win#4348](https://github.com/docker/for-win/issues/4348) * Docker Desktop now supports a configurable user timeout for VMs on slower machines. [docker/for-win#4393](https://github.com/docker/for-win/issues/4393) * Restricted the `cluster-admin` role on local Kubernetes cluster to `kube-system` namespace. * Reduced the VM startup time. swap is not created every time a virtual machine boots. * Fixed a bug which caused Windows to crash when a user cancels switching the version using Windows User Account Control (UAC) settings. * Fixed an issue where Docker Desktop restarts when a user logs out of Windows and logs back in, which results in retaining the exported ports on containers. * Fixed Kubernetes installation with VPNkit subnet. * Fixed a bug where the process output was not redirected to stdout when gathering diagnostics on Windows, which sometimes resulted in a crash. * Fixed race condition where Kubernetes sometimes fails to start after the app is restarted. * The system tray icon now opens the Docker Desktop menu with left and right mouse button. * When displaying the crash report window, Docker Desktop does not send a bugsnag crash report unless the user needs the report to upload diagnostics. * Docker Desktop has removed the ability to log in using email address as a username as the Docker command line does not support this. * For Linux containers on Windows (LCOW), the host must run Windows 10 Professional or Windows 10 Enterprise version 1809 or later. * The **Send usage statistics** checkbox is selected by default in Docker Desktop for Windows Community. This option cannot be modified. * Docker Desktop has added a new dialog box during startup which allows users to retry mounting a shared drive or remove it from the shared drives list after a failed attempt. * Fixed the Kubernetes Delete operation of persistent volume claims on Windows. * Docker Desktop now truncates UDP DNS responses which are over 512 bytes in size. * Fixed a bug where Docker was not added to PATH after installation in some cases. * Fixed port 8080 that was used on localhost when starting Kubernetes. * Renamed the product from **Docker for Windows** to **Docker Desktop**. * Fixed the **Create issue** link in the Diagnostics window. * Fixed a bug related to service log collection in diagnostics. * Docker Desktop now gathers `/etc/hosts` to help with diagnostics. * Added the missing daemon options in Docker Engine 18.09. * When two services have a common exposed port, Docker Desktop exposes the available ports for the second service. * Fixed the UI lock when changing the Kubernetes state.

This section details a variety of bug fixes and improvements in Docker Desktop. Key fixes address issues related to Docker Desktop upgrades, VM lifecycle operations, Windows crashes during UAC changes, Kubernetes startup failures, and more. It also includes improvements like configurable VM timeouts, restriction of Kubernetes roles, reduced VM startup time, and updated diagnostic gathering. New features/changes include a dialog box for retrying shared drive mounts, truncation of UDP DNS responses, removal of email login, and renaming the product to Docker Desktop.