==== Create partition table ====
Use `parted` to create something like this (partition 3 for the data from the original VM)
 <code>
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
</code>

==== Copy data to new disk ====

=== Add partitions to the kernel for use when copying data ===
<code>
partx -a /dev/mapper/vgname-diskname
</code>

=== Copy data ===
<code>
cp /dev/org-disk /dev/mapper/vgname-diskname3
</code>

=== Remove the partitons from the kernel ===
<code>
partex -d /dev/mapper/vgname-diskname
# or if it is not working
dmsetup remove vgname-diskname{partnr}
</code>

==== Create VM with libvirt ====
Debian 11 is currently the highest supported debian os in Debian Bookworm
<code>
virt-install -n <vmname> --import --memory <memsize_in_mb> --disk /dev/vgname/diskname --osinfo debian11 --noautoconsole --network 'network=host-bridge' --graphics vnc --boot uefi
</code>

==== To connect with Virtual Machine Manager (VMM) remotely ====
Allow ssh with root
<code>
echo "PermitRootLogin yes" > /etc/ssh/sshd_config.d/tmp_permit_root_login.conf
systemctl restart ssh
</code>

==== 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)
<code>
mkfs.fat -n EFI /dev/vda1
mkfs.ext2 -m 0 -L boot /dev/vda2
</code>

==== Edit /etc/fstab ====
Add something like this (and make sure existing entries point to the correct device/partition)
<code>
/dev/vda2 /boot ext2 defaults 0 2
/dev/vda1 /boot/efi vfat umask=0077 0 1
</code>

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
<code>
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)
</code>

Edit /etc/default/grub so that the serial console works
<code>
GRUB_CMDLINE_LINUX="console=ttyS0,115200"
</code>

Install GRUB and update GRUB config and initramfs
<code>
grub-install --force-extra-removable
update-grub
update-initramfs -u
</code>

==== Configure VLAN for NIC if needed ====
Edit VM XML configuration
<code>
virsh edit <vmname>
</code>

Update NIC with something like this
<code>
<vlan>
  <tag id='<vlanid>'/>
</vlan>
<virtualport type='openvswitch'>
</virtualport>
</code>