bad shim signature you need to load the kernel first

[emm980]

Hi dears, I'm quite new Kubuntu user from Italy! I love to use this OS in dual boot laptop and every day all goes fine until update kernel 5.19.0.27
On PC boot I retrieve this message and I've only the opportunity to boot with previous 5.0.19.24 image. I'm trying to update manually (through UBUNTU MAINLINE KERNEL) to install different kernel, however, nothing change. Which could be the issue and how can I solve it? Thanks in advance for any help! Ciao

[oshunluvr]

I wouldn't use a mainline kernel unless you really know what you are doing.

So you're saying you can boot to 5.19.0-24 but 5.19.0-27 is installed and doesn't show in your boot menu? Or are you saying the -27 kernel fails to boot when you select it?