Installing Drive OS 6.0 from sdkmanager is giving an error?

Autonomous Vehicles DRIVE AGX Orin DRIVE AGX Orin General
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As we know you have other support channels available, I suggest reporting this issue there. It seems that the issue may be related to an apt mess-up, so you could try installing with a docker container (see Install DRIVE OS Linux Docker Containers from NGC | NVIDIA Docs).