Ubuntu installation writes into foreign partitions and MBR without permission, damaging other operating systems on the disk
Below is the original text of the question as I posted it. Underneath some new information.
I want to install Ubuntu 10.04 LTS Desktop AMD64 on a PC that has a terabyte sized hard disk, which is already fully partitioned (with two partitions prepared for Ubuntu and Ubuntu's swap device). On that system there is a Logical Volume Manager installed (IBM). This LVM could be ignored by Ubuntu, as it is meant for an existing, working, bootable JFS partition containing eComStation, which is the current version of IBMs OS/2.
But unfortunately, Ubuntu trashes the LVMs information on the disk, either the DLAT or the BBR. After installing Ubuntu _and telling it not to install Grub2 into the MBR (!)_ the LVM info gets damaged beyond repair. Ubuntu runs flawlessly, having actually installed Grub2 into it's partitions PBR, as instructed.
But eComStation won't run, and a Logical Volume Manager run from CD complains corrupt partition info (the actual partition table is intact. But disk editing tools like DFsee show that it's the LVM info that got damaged).
IBMs LVM stores its info in the last sector of track 0, as opposed to the MBR which of course is in the first. The MBR is not damaged. It boots IBMs boot manager out of a small partition, and that runs okay. It will boot Ubuntu and every Windows installed on the system, but because of the damaged DLAT and/or BBR no longer eComStation.
The error can be pinned down to Ubuntu. Immediately before installation everything is fine, immediately afterwards it is broken, reproducibly.
Anyone got a hint why Ubuntu does this, even when told not to install boot code into /dev/sda?
a) Happens with 10.04.1, too, and also happens using the installation function of a running Live Ubuntu
b) I bulk copied the entire hard disk to external storage and so I am able to binary compare immediately before and immediately after installing Ubuntu in /dev/sda9 (and Grub2 in there, too, not into the MBR). I am scanning the whole disk, but apparently Ubuntus installer wrote, without permission, into /dev/sda5 which contains the JFS partition of eComStation.
|Oliver K (ok23) wrote : Re: Ubuntu installation writes into foreign partitions and MBR without permission||#3|
Ubuntu installation writes into foreign partitions and MBR without
+ permission, damaging other operating systems on the disk
|Changed in ubiquity (Ubuntu):|
|status:||New → Confirmed|
|Colin Watson (cjwatson) wrote : Re: [Bug 669459] Re: Ubuntu installation writes into foreign partitions and MBR without permission, damaging other operating systems on the disk||#18|