Comment 7 for bug 1800750

This also happened to me.

> Did the upgrade process fail?

no

> If you run 'sudo apt -f install' is any change suggested there?

no

> Did you modify the allowed Secure Boot certificates in your machine's firmware?

$ mokutil --sb-state
This system does't support Secure Boot

I could have disabled secure boot altogether to get my dual boot setup to work, I honestly can't remember all the details. But given that I haven't even enabled secure boot, this error seems all the more strange to me.

> What hardware did this error show up on?

MacBookPro 12,1 [Intel Core i7-5557U] (early 2015)