Hi,
it seems you already received all information necessary to resolve the issue in the message you quoted, this is a feature, not a bug, it's up to you to make sure third party kernels you install are appropriately signed.
Hi,
it seems you already received all information necessary to resolve the issue in the message you quoted, this is a feature, not a bug, it's up to you to make sure third party kernels you install are appropriately signed.