Hey there!

I am trying to patch my Ubuntu version with grsecurity.
I'm working with Ubuntu Server 12 32bit inside a Windows 7 virtual machine.
Windows 7 is running VirtualBox.
For patching I used the official tutorial of grsecurity wikibooks.
This means that I downloaded the right version of the Linux kernel and patched it with the latest version of grsecurity.
Then I installed the kernel by issuing the following command:
make-kpkg clean
fakeroot make-kpkg --initrd --append-to-version=-grsecurity kernel_image kernel_headers
Now when I try to boot Ubuntu, it hangs at the following point:


Also I can't use recovery mode anymore, because I am unable to select anything.
The [[B character sequence appears when I press the down button.


I really have no clue what to do.
I googled around a lot for the error but I couldn't find a working solution.

Some information about my system:

00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
00:01.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)
00:02.0 VGA compatible controller: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter
00:03.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller (rev 02)
00:04.0 System peripheral: InnoTek Systemberatung GmbH VirtualBox Guest Service
00:05.0 Multimedia audio controller: Intel Corporation 82801AA AC'97 Audio Controller (rev 01)
00:06.0 USB controller: Apple Inc. KeyLargo/Intrepid USB
00:07.0 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 08)
00:0b.0 USB controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller
00:0d.0 SATA controller: Intel Corporation 82801HM/HEM (ICH8M/ICH8M-E) SATA Controller [AHCI mode] (rev 02)
Please help me get past this annoying screen!
If you need more information please tell me, I am out of options.
I know my way around Linux, but I wouldn't call myself an advanced user.