Table of Contents

Create partition table

Use `parted` to create something like this (partition 3 for the data from the original VM) 

Model: Linux device-mapper (linear) (dm)
Disk /dev/dm-10: 6442MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name   Flags
 1      1049kB  257MB   256MB                EFI    boot, esp
 2      257MB   769MB   512MB                boot
 3      769MB   5930MB  5161MB  ext4         linux
 4      5930MB  6441MB  512MB                swap   swap

Copy data to new disk

Add partitions to the kernel for use when copying data

partx -a /dev/mapper/vgname-diskname

Copy data

cp /dev/org-disk /dev/mapper/vgname-diskname3

Remove the partitons from the kernel

partex -d /dev/mapper/vgname-diskname
# or if it is not working
dmsetup remove vgname-diskname{partnr}

Create VM with libvirt

Debian 11 is currently the highest supported debian os in Debian Bookworm 

virt-install -n <vmname> --import --memory <memsize_in_mb> --disk /dev/vgname/diskname --osinfo debian11 --noautoconsole --network 'network=host-bridge' --graphics vnc --boot uefi

To connect with Virtual Machine Manager (VMM) remotely

Allow ssh with root 

echo "PermitRootLogin yes" > /etc/ssh/sshd_config.d/tmp_permit_root_login.conf
systemctl restart ssh

Boot Debian installation in rescue mode

Add the Debian Install cdrom image (using VMM) and boot it (select rescue).

Create FS for EFI and boot partitons

Install `dosfstools` if needed (for mkfs.fat) 

mkfs.fat -n EFI /dev/vda1
mkfs.ext2 -m 0 -L boot /dev/vda2

Edit /etc/fstab

Add something like this (and make sure existing entries point to the correct device/partition) 

/dev/vda2 /boot ext2 defaults 0 2
/dev/vda1 /boot/efi vfat umask=0077 0 1

And then mount /boot and /boot/efi (create folders, copy boot data etc.)

Install GRUB

Make sure that correct GRUB is installed
Remove grub-xen-* and install grub-efi-amd64-signed and grub-efi-amd64 

ii  grub-common                     2.06-13+deb12u1                amd64        GRand Unified Bootloader (common files)
ii  grub-efi-amd64                  2.06-13+deb12u1                amd64        GRand Unified Bootloader, version 2 (EFI-AMD64 version)
ii  grub-efi-amd64-bin              2.06-13+deb12u1                amd64        GRand Unified Bootloader, version 2 (EFI-AMD64 modules)
ii  grub-efi-amd64-signed           1+2.06+13+deb12u1              amd64        GRand Unified Bootloader, version 2 (amd64 UEFI signed by Debian)
ii  grub2-common                    2.06-13+deb12u1                amd64        GRand Unified Bootloader (common files for version 2)

Edit /etc/default/grub so that the serial console works 

GRUB_CMDLINE_LINUX="console=ttyS0,115200"

Install GRUB and update GRUB config and initramfs 

grub-install --force-extra-removable
update-grub
update-initramfs -u

Configure VLAN for NIC if needed

Edit VM XML configuration 

virsh edit <vmname>

Update NIC with something like this 

<vlan>
  <tag id='<vlanid>'/>
</vlan>
<virtualport type='openvswitch'>
</virtualport>