Downgrading Ubuntu on Jetson Orin Nano: Feasibility and Implications

Issue Overview

Users are inquiring about the possibility of downgrading the Ubuntu operating system on the Nvidia Jetson Orin Nano 8GB from the default Ubuntu 20.04 to Ubuntu 18.04. This question arises from a desire to modify the default software configuration of the device. The main concerns include:

• Feasibility of downgrading or upgrading the operating system
• Official recommendations from Nvidia regarding such modifications
• Potential differences in functionality compared to the default Ubuntu 20.04 installation

The issue impacts users who may require a specific Ubuntu version for compatibility reasons or personal preference, and raises questions about the flexibility and customization options available for the Jetson Orin Nano platform.

Possible Causes

1. Software compatibility requirements: Users may need an older Ubuntu version to run specific applications or development environments.

2. Familiarity with older systems: Some developers might be more comfortable working with Ubuntu 18.04 due to previous experience.

3. Performance considerations: There might be a perception that an older OS version could offer better performance on the hardware.

4. Specific feature availability: Certain features or packages might be more readily available or stable on Ubuntu 18.04.

5. Project requirements: Some projects or organizations may standardize on a particular Ubuntu version across all devices.

Troubleshooting Steps, Solutions & Fixes

1. Official Recommendation:

   • Nvidia does not recommend downgrading the Ubuntu version on the Jetson Orin Nano.
   • Stick with the default Ubuntu 20.04 installation for optimal performance and support.

2. Customizing rootfs (for advanced users):

   • If you still want to attempt modifying the operating system, refer to the "Customizing rootfs" section in the Nvidia Developer Guide.
   • This process allows for some level of customization but comes with risks and is not officially supported.

3. Alternative Approach:

   • Instead of downgrading, consider using containerization technologies like Docker to run Ubuntu 18.04 environments within the default 20.04 system.
   • This approach maintains system stability while allowing access to 18.04-specific tools or libraries.

4. Backup Important Data:

   • Before attempting any major system modifications, ensure all important data and configurations are backed up.

5. Research Compatibility:

   • Thoroughly research the compatibility of your required software and tools with Ubuntu 20.04.
   • Many applications and libraries available for 18.04 may have updated versions or alternatives for 20.04.

6. Consult Nvidia Forums:

   • For the latest information or community experiences, consult the Nvidia Developer Forums.
   • Search for similar attempts or ask for guidance from experienced users.

7. Consider Consequences:

   • Be aware that downgrading may lead to:
     • Loss of hardware support or optimizations specific to the Jetson Orin Nano
     • Potential instability or reduced performance
     • Lack of official support from Nvidia for troubleshooting

8. Explore Jetson Linux Customization:

   • Instead of a full OS downgrade, explore options for customizing Jetson Linux to meet your specific needs while maintaining the 20.04 base.

Remember, while it may be technically possible to modify the operating system, it’s not recommended by Nvidia and could lead to unforeseen issues. Always prioritize stability and official support when working with specialized hardware like the Jetson Orin Nano.