Comment 10 for bug 1529450

Maybe it helps for reproducing the problem: I wanted to install today's daily in a Parallels virtual machine and got this error.

I do not know if the installer wants to read the secure boot key (I assume that the Parallels virtual machine does not have one), or if I am misinterpreting the error message.

Still, I was able to continue with the installation:
1) Open Konsole
2) cd /usr/lib/ubiquity/plugins
3) sudo pico ubi-prepare.py
4) Scroll sown to the end of the file
5) Some lines up change:
5.1) secureboot_key = self.ui.get_secureboot_key() => # secureboot_key = self.ui.get_secureboot_key()
5.2) if self.ui.using_secureboot and secureboot_key: => # if self.ui.using_secureboot and secureboot_key:
5.3) self.preseed('ubiquity/secureboot_key', secureboot_key, seen=True) => # self.preseed('ubiquity/secureboot_key', secureboot_key, seen=True)
6) CTRL + O ; ENTER ; Start installer again

A wild guess: maybe the problem is just a missing check if the secureboot key could be read.