I'm installing Ubuntu 16.04 with manual partitioning, and need to choose a separate partition for /var/log. However, in the installer, there does not seem to be an option for doing this. The drop-down menu only has /, /boot, /home, /tmp, /usr, /var, /srv, /opt, and /usr/local.
What is the easiest way to put /var/log on a separate partition?