Public bug reported:

Binary package hint: debian-installer

Please note I have reproduced this on 7.04. If needed I can attempt to
reproduce the bug on a newer version, but I haven't had the time and it
should still be fixed on 7.04 anyway.

I extracted the kernel and initrd from mini.iso to a usb pendrive and
used syslinux to boot into debian-installer. Everything goes just fine,
except for installing grub. It always installs to /dev/sda (which is the
USB drive), then upon reboot, it fails to boot unless the usb stick is
in the drive.

I can install from the USB pendrive, and as long as I remove the
pendrive as soon as I get to the "loading additional modules" stage,
where it presumably downloads and modprobes various non-network drivers
(i.e. disks!), my hard drive is /dev/sda and everything is 100% fine,
because the drive ends up being the same after installation.

If I leave the pendrive in during the module loading stage, the pendrive
gets detected as /dev/sda, while the (sata) hard drive is detected as
/dev/sdb causing badness down the road, because upon reboot, the actual
kernel recognizes the hard disk as /dev/sda while the pendrive is either
not present (I'm done installing) or it is /dev/sdb.

It appears this has affected others...

http://ubuntuforums.org/archive/index.php/t-484108.html

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New

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debian-installer fails to configure grub correctly when booted from a usb 
pendrive
https://bugs.launchpad.net/bugs/181908
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