Publish verified Ubuntu desktop preview setup and evidence

README.md

@@ -88,9 +88,15 @@ Already installed? Close searchi before installing the update. Version 0.1.3
 adds isolated PDF/DOCX processing and more reliable, bounded media previews.
 
 The installer creates a launcher and sets up WebView2 if needed. This initial
-release is unsigned. macOS and Linux desktop packages follow; source build instructions
+release is unsigned. A Linux desktop preview is also available; macOS source build instructions
 are available now. You can also let your local AI agent handle setup.
 
+**Ubuntu 24.04 x64 desktop preview:** [Download the Debian package](https://tea.karlcom.de/karl/searchi/releases/download/v0.1.3/searchi_0.1.3_amd64.deb)
+and install with `sudo apt install ./searchi_0.1.3_amd64.deb`.
+[Checksums](https://tea.karlcom.de/karl/searchi/releases/download/v0.1.3/LINUX-DESKTOP-SHA256SUMS-0.1.3.txt).
+Startup was tested in WSL using CPU; native graphical interaction and other
+distributions still need testing. [Compatibility and evidence](docs/LINUX-DESKTOP.md).
+
 **Running a Linux server?** The optional
 [Linux x64 headless preview](https://tea.karlcom.de/karl/searchi/releases/download/v0.1.3/searchi-headless_0.1.0_linux-x86_64-013.tar.xz)
 includes the CLI, read-only MCP server, Google runtime and media helpers.
@@ -108,7 +114,7 @@ Official repository: https://tea.karlcom.de/karl/searchi
 
 Detect my operating system and processor architecture. Use a suitable official
 release from the README or releases page, including the Windows installer or
-compatible Linux headless archive. Check its documented system requirements,
+compatible Ubuntu desktop package or Linux headless archive. Check its documented system requirements,
 verifying its published checksums. Otherwise,
 set up the current source version using the repository's installation/build
 instructions. Handle the required tools and dependencies for me; don't just
@@ -134,7 +140,8 @@ followed by a search in my own words.
 ```
 
 Your agent needs internet access and permission to install software locally.
-Windows x64 setup can use the published installer; compatible headless Linux
+Windows x64 setup can use the published installer; Ubuntu 24.04 x64 can use the
+desktop preview, and compatible headless Linux
 systems can use the preview archive. Other platforms currently build from
 source. The local search model downloads approximately **865 MB**
 once, and cached assets are reused. Your agent should report any platform