Clean FreeBSD install does not boot

2018-01-02 - How to fix a clean install that refuses to boot
Tag: FreeBSD

How to fix

I installed a fresh FreeBSD server today, and to my surprise it refused to boot. I had to do the following from my liveUSB :

gpart set -a active /dev/ada0
gpart set -a bootme -i 1 /dev/ada0