Elgg 1.5 not installing on linux

I've just tried a clean install of elgg 1.5 on a clean VM; I go through the first setup screen asking for database info, get to the system settings screen, and when I hit 'Save' it gives me a 404 with the following message:

The requested URL /action/systemsettings/install was not found on this server.

Sure enough, /action/... doesn't exist; the path in the install is /actions/...

So I tried making a symlink from action to actions to work around what I thought was a typo; but when I try saving the settings, this time I get:

Fatal error: Call to undefined function elgg_set_viewtype() in /var/www/actions/systemsettings/install.php on line 16