Wikimedia Bugzilla is closed!

For latest master, rebuilding the box gives this at the end. Tried rebuilding box several times, on both 1.6.3 and 1.5.4

...
==> default: Mounting shared folders...
    default: /vagrant => C:/Users/user/mw/v
Failed to mount folders in Linux guest. This is usually because
the "vboxsf" file system is not available. Please verify that
the guest additions are properly installed in the guest and
can work properly. The command attempted was:

mount -t vboxsf -o uid=`id -u vagrant`,gid=`getent group www-data | cut -d: -f3` /vagrant /vagrant
mount -t vboxsf -o uid=`id -u vagrant`,gid=`id -g www-data` /vagrant /vagrant