After a system update, bad shim signature | Silverblue | F40

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I’m experiencing the same issue with two of my Fedora Kinoite 39 devices. The error message is exactly the same as the one shown in your picture. Given the timing of the updates, the issue is related to the new kernel version 6.9.4 from your recent update.

Upgraded:
  dmidecode 1:3.5-1.fc39 -> 1:3.6-1.fc39
  kernel 6.8.11-200.fc39 -> 6.9.4-100.fc39
  kernel-core 6.8.11-200.fc39 -> 6.9.4-100.fc39
  kernel-headers 6.8.3-200.fc39 -> 6.9.4-100.fc39
  kernel-modules 6.8.11-200.fc39 -> 6.9.4-100.fc39
  kernel-modules-core 6.8.11-200.fc39 -> 6.9.4-100.fc39
  kernel-modules-extra 6.8.11-200.fc39 -> 6.9.4-100.fc39
  kernel-tools 6.8.11-200.fc39 -> 6.9.4-100.fc39
  kernel-tools-libs 6.8.11-200.fc39 -> 6.9.4-100.fc39

I applied the workaround mentioned above and resolved the issue.

Alternatively, you can also disable secure boot if you prefer not to use the workaround.

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