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I upgraded my system 23.10 to 24.04 however, it still shows me kernel kernel 6.8 can't be used

these below many screen shots for this issue while now my system is 24.04 but on old kernel

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How to allow using new kernel after the upgrade?

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  • Can you not turn off that secure boot?
    – David
    Commented Jun 25 at 8:26
  • I disabled it and it booted last kernel 6.8.7 successfully. but once I enable it, it repeats same issue that says BAD SHIM SIGNATURE. so, I try to choose older kernel like 6.8.0 than kernel 6.8.7 then it boots
    – eeesa
    Commented yesterday

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