Cannot find multiboot and nitdroid installer package in Nokia N900

[Nephtys]

I gone after the NITDroid installation procedure inside my Nokia N900 but when I write
Code:

apt-get install multiboot multiboot-kernel-maemo

I get:

Reading package lists... complete
Building dependency tree       
Reading status information... complete
E: Couldn't find package multiboot option

I get the same kind of error if I attempt to download NITDroid installer. I have also attempt apt-get update but I obtain the similar error if I attempt to download multiboot or nitdroid. Extra devel is enabled but I can’t observe multiboot and nitdroid installer in application manager too, all additional extra devel apps are obtainable.

[Algonkin]

Before you start you require to add the extras devel repository: using this command:

apt-get -y install wget bzip2 rootsh nano kexec-tools
 'Download as well as install Multiboot 
wget downloads.nitdroid /multiboot-extras_0.1_armel.deb 
wget downloads.nitdroid/multiboot_0.2.5_armel.deb 
dpkg -i multiboot*.deb

Now you require to add a menu access for Nitdroid in multiboot

BOF
cd /etc/multiboot.d 
cat > NITdroid-2.6.28.NIT.05.item << EOF 
ITEM_NAME="NITdroid on MMCp3 - 2.6.28.NIT.05"
ITEM_KERNEL=2.6.28.NIT.05
ITEM_MODULES=ext3 fatal 
ITEM_DEVICE=\${EXT_CARD}p3
ITEM_FSTYPE=ext2
ITEM_FSOPTIONS=rw,delete not on time errors, errors=remount-ro, commit=3
EOF

[Nyah]

I obtain the following error when I write apt-get update in xterminal to get the Nitdroid installer inside my device:

The following signatures were invalid: BADSIG E40DC434616730BD maemo Extras repositories (Fremantle Extras) <repositories.maemo >
W: GPG error: moff.mozilla chinook liberate: The following signatures couldn't be established since the public key is not accessible: NO_PUBKEY 667387BFFF445C24
W: You may desire to run apt-get update to correct these problems once again.

[switchblade327]

For downloading and installing the nitdroid installer packages you will require to get the root access and type the following code:

BOF
mkdir -p /and
mount -o noatime,rw /dev/mmcblk1p2 /and
cd /home/usr1/MyDocs
wget downloads.nitdroid/nitdroidinstaller/Packages/NITDroid-N900-the-flying-world.tbz2
rm -rf /and/*
bzcat NITDroid-N900-the-flying-world.tbz2 | tar xvC /and
EOF

Installing the nitdroid kernel 
wget downloads.nitdroid/nitdroid-kernel-2.6.28-06_final1_armel.deb
dpkg -i nitdroidinstaller keenel *deb