apt-get install busybox-initramfs mdadm lvm2

Activate LVM volumes and boot:

lvm vgchange -ay
mount /dev/disc2/btrfs2 /root -o device=/dev/disc1/btrfs1
exit

Each script can be called with prereqs argument.

• If update-initramfs -k all -u generates more initramfs than installed kernels, please check content of directory /var/lib/initramfs-tools/

• dropbear: WARNING: Invalid authorized_keys file, remote unlocking of cryptroot via SSH won't work!

  • /usr/lib/dropbear/dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key /etc/dropbear-initramfs/dropbear_dss_host_key
    /usr/lib/dropbear/dropbearconvert openssh dropbear /etc/ssh/ssh_host_ecdsa_key /etc/dropbear-initramfs/dropbear_ecdsa_host_key
    /usr/lib/dropbear/dropbearconvert openssh dropbear /etc/ssh/ssh_host_rsa_key /etc/dropbear-initramfs/dropbear_rsa_host_key
    cp ~/.ssh/authorized_keys /etc/dropbear-initramfs
    update-initramfs -u