Stuck at "Waiting for installer to finish"

[certik]

I have Ubuntu 12.04 (64-bit) and so I had to use the https://github.com/goraxe/vagrant-ubuntu-precise-64 clone, de4c601. It works, but it gets stuck at "Waiting for installer to finish":

ondrej@hawk:~/repos/vagrant-ubuntu-precise-64(master)$ ./build.sh 
Cleaning build directory ...
[sudo] password for ondrej: 
Downloading ubuntu-12.04-alternate-amd64.iso ...
Creating Custom ISO
Untarring downloaded ISO ...
Backing up current init.rd ...
Installing new initrd.gz ...
40870 blocks
40874 blocks
Cleaning up Permissions ...
Replacing isolinux config ...
Add late_command script ...
Running mkisofs ...
Creating VM Box...
Virtual machine 'ubuntu-precise-64' is created and registered.
UUID: 288fd798-5940-4e24-a1a4-af34a1f064db
Settings file: '/home/ondrej/repos/vagrant-ubuntu-precise-64/build/vbox/ubuntu-precise-64/ubuntu-precise-64.vbox'
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Disk image created. UUID: a7dfbb6f-d351-4656-b469-51faf0f631b6
Waiting for VM "ubuntu-precise-64" to power on...
VM "ubuntu-precise-64" has been successfully started.
Waiting for installer to finish ..............................................................................................................................................................................................................

Any ideas how to debug this?