Update README.md

README.md

@@ -3,7 +3,7 @@
 Current Version : INSEL 8.3 Beta7:
   * For [Windows](https://bwsyncandshare.kit.edu/s/nenYqtBfkfncJxC).
   * For [Ubuntu 20.04](https://bwsyncandshare.kit.edu/s/QFYeyRg8isnAE2G)
-  * For Ubuntu 18.04 TODO
+  * For [Ubuntu 18.04](https://bwsyncandshare.kit.edu/s/Pb33bGgmDwsqgbN)
   * For [macOS](https://bwsyncandshare.kit.edu/s/bBRFYwsoLMqPSE6) (Very experimental)
 
 ## Timeline