Upgrading Linux With Debootstrap And Chroot

Mar 8, 2016

Best Case:

do-release-upgrade -d  // dev version

Other Cases:

  1. Format and Partition Hard Disk gparted - making first partition with: - fat32 format - ‘boot’ and ‘esp’ flags - including an extra partition for persistence later - likely use ext4 for linux

  2. Bootstrap the OS

     ap_install binutils debootstrap
     mount /dev/hda1 /mnt
     /usr/sbin/debootstrap --arch $ARCH $RELEASE $MNT $URL_SRC
    • where:
      • $ARCH, e.g., amd64
      • $RELEASE, e.g., wily
      • $MNT, e.g., /mnt
      • $URL_SRC, e.g., http://archive.ubuntu.com/ubuntu
  3. Prepare to chroot a. sysctl kernel.hostname=NEW_HOSTNAME b. Plan on copying fstab to target disk and using blkid to identify target disk UUID that will replace fstab source disk UUID c. Consider copying network info before rebooting: - /mnt/etc/network/interfaces - /mnt/etc/hosts - /mnt/etc/resolv.conf

  4. Chroot into target disk/OS

     mount -t proc none /mnt2/proc; \
     mount -o bind /dev /mnt2/dev; \
     LANG= chroot /mnt2 /bin/bash
     dpkg-reconfigure --default-priority passwd  // create a user and switch shadow password on
  5. Installing Packages

    • Basics:
      • apt-get update
      • openssh-server
      • ubuntu-standard
      • linux-image-$ARCH
    • Perhaps copy “some” from existing system:
    • Maybe set some environment vars
  locale-gen en_US.UTF-8
  echo 'LANG="en_US.UTF-8"' >> /etc/environment
  echo 'LANGUAGE="en_US:en"' >> /etc/environment
  1. Gracefully end chroot

     cd /
     for i in /mnt/proc /mnt/dev /mnt
     do umount $i; done

(Primary Source)

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