How do i install virtualbox-guest-additions on fedora silverblue

I recently installed Fedora Silverblue on Virtualbox. I tried to install the Virtualbox Guest Additions but it always fails. First, I tried: sudo rpm-ostree install virtualbox-guest-additions But I got: error: “virtualbox-guest-additions” is already provided by: virtualbox-guest- additions-6.0.4-2.fc30.x86_64. Use –allow-inactive to explicitly require it. The system says that the Virtualbox Guest Additions are already installed but…

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Solidity assembly: why is the length of _bytes added to _bytes before mload()?

For example in BytesLib: https://github.com/GNSPS/solidity-bytes-utils/blob/master/contracts/BytesLib.sol#L348 function toUint96(bytes memory _bytes, uint _start) internal pure returns (uint96) { require(_bytes.length >= (_start + 12)); uint96 tempUint; assembly { tempUint := mload(add(add(_bytes, 0xc), _start)) } return tempUint; }

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