FWIW I just did an install alongside with UEFI and secure boot. Admittedly the first OS was another Lubuntu and not Windows, but still, it's not clear what conditions are necessary to reproduce this nor what the exact symptoms are.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2042911 Title: Calamares fails -External command finished with errors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/calamares/+bug/2042911/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
