I have the same issue with secure boot enabled. Unsigned kernel 5.12-rc7+8 won't boot unless secure boot is disabled: invalid signature. Mok manager is not responding. ThinkPad Kubuntu or Ubuntu 21.04.
I have the same issue with secure boot enabled. Unsigned kernel 5.12-rc7+8 won't boot unless secure boot is disabled: invalid signature. Mok manager is not responding. ThinkPad Kubuntu or Ubuntu 21.04.