Ok, and your efibootmgr output shows:
BootCurrent: 0001
[...]
Boot0001* ubuntu
HD(2,GPT,97bd7694-b600-487f-a866-7694c80b6ead,0xfa000,0x32000)/File(\EFI\ubuntu\shimx64.efi)
So in fact, the shim package is correctly installed, is correctly
installed to the ESP, and is correctly registered with the firmware.
So it's currently unclear to me why this system is failing to boot when
SecureBoot is enabled. And I don't think reinstalling 19.04 will help
you any.
** Changed in: shim (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1821630
Title:
After enabling Secure Boot - unable to boot Ubuntu
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