SDK manager error

when im in SDK manager step3,there is a window illustrate an Internet connection error:SDK Manager detected your system may not ready for installation, seespecific errors belowOnce fixed,click’Retry’ to verify svstem readiness aqain’Skip’ this process may result install installation failure.
The picture below shows details
my computer enviroment: ubuntu 20.04
target equipment: jetson orin nano 8GB

There might be network issue at that moment, please avoid to access it under proxy environment.
Suggest to try again.