Thread: "ALERT! /dev/mapper/my-root does not exist" for encrypted root partition

hi all,

had machine running ubuntu 8.4 2 luks encrypted hard disk drives mounted / , /home. after 2 years of work decided upgrade os 10.1. ran upgrade has succeeded on night (it pretty old machine).
after upgrade machine restarted , after splash screen error message
"alert! /dev/mapper/my-root not exist. dropping shell"

/dev/mapper/my-root not exist of course.
if run

code:

mkdir -p /mnt/root  cryptsetup luksopen /dev/sda5 my-root  mount -t ext3 /dev/mapper/my-root /mnt/root

the /dev/mapper/my-root appears in place , root partition opened , mounted /mnt/root.

guess need boot system make above process happen automatically on boot.
can see in /etc folder (being in initramfs console) there neither fstab nor crypttab files.

understand correctly in order fix machine need mount (natureally unencrypted) boot partition, extract initrd of new ubuntu version, add fstab , crypttab image, pack , edit grub's menu.lst pick customized initrd image?

stuck @ moment fact cannot pack initrd since busybox's cpio apparently supports unpacking (-o flag throws error) need linux boot cd there. until i'd ask advise, whether on right path or miss basic?

thank much!

Forum The Ubuntu Forum Community Ubuntu Official Flavours Support Installation & Upgrades [kubuntu] "ALERT! /dev/mapper/my-root does not exist" for encrypted root partition

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