Transfer system to a new computer

[Volker Wysk]

Hi!

I've found an error. The boot partition needs to be moved too. See
below.

Am Sonntag, den 12.01.2020, 19:34 +0100 schrieb Volker Wysk:
> Hi!
> 
> I'm about to buy a new computer, including a new SSD. At the
> beginning,
> I'll habe both SSDs (old and new) in the new machine, and I want to
> move the system on the old one to the new one. 
> 
> The old system has been set up by the ubuntu installer with an
> encrypted root file system. This means that LVM is being used. I want
> to take this occasion to get rid of LVM. This means, the new system
> on
> the new SSD should have one encrypted partition for the root file
> system, one unencrypted one for /boot and no partition for swap. I'll
> use a swap file instead.
> 
> I have outlined the procedure of this transition. I'd be grateful if
> someone could have a look at it:
> 
> 1. Boot from maintenance USB stick. 
> 
> 2. Use gdisk to partition the new SSD, which I assume is at /dev/sda.
> Make a /boot partition at /dev/sda1 (2 GB). Dedicate most of the rest
> to the new root partition, which is to be encrypted. It will reside
> at
> /dev/sda5. gdisk makes an GPT partition table.
> 
> 3. LUKS-format the new root partition and unlock it. Make a new ext4
> file system on it and mount it at /mnt/newroot.
> 
> cryptsetup luksFormat /dev/sda5
> cryptsetup open /dev/sda5 sda5_crypt
> mkfs.ext4 /dev/mapper/sda5_crypt
> mount /dev/mapper/sda5_crypt /mnt/newroot
> 
> 4. Unlock the old root partition and mount it at /mnt/oldroot. I
> assume
> the old SSD is at /dev/sdc.
> 
> cryptsetup open /dev/sdc5 sdc5_crypt
> sleep 1
> vgchange -a y
> mount /dev/ubuntu-vg/root /mnt/oldroot
> 
> 5. Copy the system over
> 
> cp -a /mnt/oldsystem/* /mnt/newsystem
> 
> Here, I'm not sure about dev, proc and sys. They should be empty in
> the
> old root, shouldn't they?
> 
> 6. Update /mnt/newroot/etc/crypttab. The new line for the encrypted
> root is:
> 
> sda5_crypt /dev/sda5 none luks,discard
> 
> 7. Update /mnt/newroot/etc/fstab. The new lines for root and /boot
> should be:
> 
> /dev/mapper/sda5_crypt / ext4 errors=remount-ro 0 1
> /dev/sda1 /boot ext4 defaults 0 2

7 1/2. Copy boot partition.

mkdir /mnt/newboot /mnt/oldboot
mount /dev/sdc1 /mnt/oldboot
mount /dev/sda1 /mnt/newboot
cp -a /mnt/oldboot/* /mnt/newboot
umount /mnt/newboot

> 8. Make the new root partition bootable.
> 
> mount --rbind /dev /mnt/newroot/dev
> mount --rbind /proc /mnt/newroot/proc
> mount --rbind /sys /mnt/newroot/sys
> mount /dev/sda1 /mnt/newroot/boot
> chroot /mnt/newroot
> update-initramfs -u
> grub-install /dev/sda
> update-grub
> 
> 9. Reboot.
> 
> 
> What I'm not so sure about, is UEFI and Secure Boot...
> 
> Cheers,
> Volker