ubiquity crashes on boot: ValueError: invalid literal for int() with base 10: ''

[Chris J Arges]

I tried installing the latest Xenial desktop iso and ubiquity fails when clicking on 'Continue' in the first screen (after setting up a network).

I looked at the code and /usr/lib/ubiquity/ubiquity/install_misc.py line 486 is where this fails.
If I add the following before 'return (int(secureboot) == 1)' then the installer continues:

if secureboot = '':
  secureboot = 0

I'm guessing the previous functions to parse this variable are returning an empty string at some point instead of an integer.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Gustav Ekner (gustav-ekner)]

I have the exact same problem in Xenial, latest daily.

[Chris J Arges (arges)]

1/25/2016 iso fails with UEFI boot mode. On another computer booting legacy BIOS mode, I can install just fine.