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Bug#510666: Installer run from USB stick should prefer iso image on stick over one on hard drive

Package: installation-reports

Boot method: USB stick
Image version: http://cdimage.debian.org/cdimage/daily-builds/daily/arch-latest/i386/iso-cd/debian-testing-i386-netinst.iso
Date: 2008 December 31

Machine: IBM Thinkpad T42
Processor: Intel(R) Pentium(R) M processor 1.70GHz
Memory: 1280MiB
sudo fdisk -l /dev/hda

Disk /dev/hda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00004eef

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1        1459    11719386   83  Linux
/dev/hda2            1460        1702     1951897+  82  Linux swap / Solaris
/dev/hda3            1703       30401   230524717+  8e  Linux LVM

Output of lspci -knn (or lspci -nn):

Base System Installation Checklist:
[O] = OK, [E] = Error (please elaborate below), [ ] = didn't try it

Initial boot:           [O]
Detect network card:    [O]
Configure network:      [O]
Detect CD:              [ ]
Load installer modules: [O]
Detect hard drives:     [O]
Partition hard drives:  [E]
Install base system:    [O]
Clock/timezone setup:   [O]
User/password setup:    [O]
Install tasks:          [O]
Install boot loader:    [O]
Overall install:        [O]


I wanted to try the USB install of lenny, so from a working lenny installation on my machine (which I intended to overwrite) I put the installer on a 2 GB USB thumb drive using:


and then downloaded debian-testing-i386-netinst.iso onto my hard drive and then copied it onto on the same partition on the USB drive.

Booting the installer went fine, but instead of finding the iso image on the USB drive, the installer found the iso image on the hard drive and mounted it. I was unable to wipe the root partition, /dev/hda1, as the installer refused saying the device was in use (or something similar). I had to boot back into the old system, remove the iso image from the drive, and boot back into the USB installer. After this the installer ran without problems.

I recommend the installer prefer to use an iso image on the same device from which the installer itself is running.

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