Function library not installed to correct path

[umbernhard]

Installing Safeboot via the instructions in the README (building a .deb and then installing it) results in "Unable to find Safeboot function library". On my machine it looks like everything is installed under /etc, but the safeboot script thinks it's installed under /usr/lib or /usr/ because the script used to find where safeboot is installed returns an empty string.

Suggested fix: add an elif to look in /etc/safeboot.

[thwalker3]

Bisect suggests that this was broken by a797d82

@nicowilliams ?

[nicowilliams]

Yeah, that's probably it.