@tonjiro20: I have not looked at the specific release, but so far as I know a 20.04 host has not yet been allowed (on the other hand I might be out of date…I only have 18.04 and have not looked).
@infinityp913: Notes about “No available releases for Ubuntu 20.04” I think are about the host PC, not the Jetson. You might be interested in these threads about “faking” the host as Ubuntu 18.04:
- https://devtalk.nvidia.com/default/topic/1048748/jetson-tx2/sdkmanager-quot-not-supported-on-linux-quot-/post/5324501/#5324501
- https://forums.developer.nvidia.com/t/sdkmanager-not-supported-on-linux/71742/13
If I am right that this is a host PC version issue, and that 20.04 simply has not yet been implemented, then the above should help.