Ok, I'll close the bug for now. If you do manage to reproduce it,
please reopen it.
** Changed in: unity (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1179122
Title:
Ubuntu's Partitioning Tool does not revert changes to partition table
Status in “unity” package in Ubuntu:
Invalid
Bug description:
I am currently running CentOS 6.x on my primary workstation. I want to
replace CentOS with Ubuntu after I found that Ubuntu has better
software repositories.
I booted up my workstation with Ubuntu 12.10 Live to test and see if
Ubuntu will recognize my CentOS encrypted luks container and determine
whether or not I can replace CentOS with Ubuntu. My system root and
home partitions are logical volumes stored in a luks container that
was originally created with Red Hat's Partitioning Tool.
I discovered that Ubuntu's Partitioning Tool does not recognize Red
Hat's encrypted luks container and will not allow Ubuntu to be
installed onto an existing logical volume. When experimenting with
Ubuntu's Partitioning Tool options to get the installer to recognize
Red Hat's partitioning scheme, I accidentally clicked the "-" next to
"change" and the Partitioning Tool recalculated the luks container to
"free space". I clicked "revert" over and over again, but to no avail.
Ubuntu's Partitioning Tool trashed my partition table and would not
let me undo the changes. I then clicked "quit" to exit out of the
Advanced Partitioning Tool window.
I tried to open the luks container, but Ubuntu's Partitioning Tool
resized the container to below the Payload Offset's boundary and
therefore the encryption failed. I then used fdisk to recreate the
partition table that the luks container is held in, starting at the
same cylinder, but with the full size of the original container. I can
now successfully use "cryptsetup luksOpen /dev/sda2 crypt" to open the
luks container, but my logical volumes have vanished.
I was able to reproduce part of this problem (Partitioning Tool
changes partition id and will not revert): When changes are made to
an existing LVM physical volume with Ubuntu's Advanced Partitioning
Tool, the "revert" function is defective and will not revert the
changes made to the partition table. Ubuntu's Partitioning Tool
changes the partition identifier from hex code 8E (Linux LVM) to a hex
code of 83 (Linux). This causes the beginning sector of the physical
volume not to line up with where it used to be, and the logical
volumes are unreadable as a result of this bug.
Can someone who is knowledgeable about the ins and outs of Ubuntu's
Advanced Partitioning Tool please inform me as to exactly what this
tool did when it recalculated my partitions. Even after I used fdisk
to recreate the partition table with the correct size and changed the
partition identifier from 83 (Linux) to 8E (Linux LVM), my logical
volumes are still unavailable. When I use "dd if=/dev/mapper/crypt
bs=512 count=255 skip=1 of=./lvm.recovery" to recover the LVM backup
headers, there is no reference to any LVM metadata.
I am very puzzled as to exactly how Ubuntu's Partitioning Tool
scrabbled my partition table and why it can't be recreated with fdisk.
I can't mount /dev/mapper/crypt as it appears to be misaligned. I
tried every backup superblock with e2fsck and none work (Bad magic
number in super-block). There must be a way to reverse this partition
alignment problem since the only thing that Ubuntu's Partitioning Tool
changed is the size and partition id?
Perhaps someone who is knowledgeable about Ubuntu's Partitioning Tool
can let me know how to reverse the damage this tool has caused to my
partition table.
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