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Since last week, my Google Compute Engine instances do not boot because of this error.


[0m[37m[40m[0m[30m[40m[2J[01;01H[0m[37m[40m  Booting `verified image A'



error: /syslinux/vmlinuz.A has invalid signature.



Press any key to continue...



  Failed to boot both default and fallback entries.

Google Cloud Console showing the serial port 1 output of failed VM

Does anybody know the cause of this failure?

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  • Filed issuetracker.google.com/issues/149154224
    – suztomo
    Feb 9, 2020 at 13:37
  • It makes sense to switch to the GRUB shell and check the boot image availability, size and modification date. Have you made any significant changes right before?
    – mebius99
    Feb 10, 2020 at 10:53
  • Thank you for the advice. In GCP console, "Enable connecting to serial ports" is grayed out, and thus I cannot check GRUB.
    – suztomo
    Feb 10, 2020 at 14:22
  • On the web page "VM instance details" you should click "Edit" atop, next tick the checkbox "Enable connecting to serial ports", and then click "Save". The remote access option "Connect to serial console" will become available.
    – mebius99
    Feb 17, 2020 at 16:29
  • @mebius99 Thanks. The option is now available. But the opened console did not accept my keyboard input. As per issuetracker.google.com/issues/149154224, it seems there's "Secure Boot" option.
    – suztomo
    Feb 18, 2020 at 14:11

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