sh startup script prompt not found

**LarkXR Management Program Deployment on Ubuntu**
The LarkXR management program supports deployment on the Ubuntu system. The specific support details are as follows:
* Server versions 3271 and below: Supported on Ubuntu 20.04
*  Server versions 3272 and above: Supported on Ubuntu 20.04 and 22.04
**Post-Deployment Issue and Resolution**
After deployment, if you encounter a "not found" error when running the startup script via   .sh  , it may be due to the default shell interpreter for the   sh   command in the Ubuntu system.
![](https://docs.paraverse.cc/media/202504/e50f5b72a0e84c2bbceb41d7deffe0845947.png)

**Cause of the Issue**
The   sh   command in Ubuntu systems defaults to using the   dash   shell, while the LarkXR startup script relies on the   bash   shell. As a result, executing the script with the default   dash   shell may cause certain commands to be unrecognized.

**Resolution**
Switch the system's default   sh   interpreter to the   bash   shell.

**Steps to Switch the Default Shell**

1. Switch the Default Shell
     Open a terminal and run the following command to switch the default shell:
     
      ```bash
      sudo dpkg-reconfigure dash
      
      ```
    When prompted, select "No" to switch the default shell to   bash  .
3. Verify the Switch
   After completing the switch, run the following command to verify if the change was successful:
   
    ```bash
    ll /bin/sh
    ```
If   /bin/sh   points to   /bin/bash  , the switch was successful.