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So, I'm going through Crunchbang's installer (very similar to Debian's), and am at the partitioning step. I chose the 'Guided - use entire disk and set up encrypted LVM' method (usually I do manual without encryption). It wiped my disk, and I set my encryption pass phrase. So now this is my current partition configuration

LVM VG $HOSTNAME,    LV root - 242.7 GB Linux device-mapper (line
     #1           242.7 GB     f  ext4      /
LVM VG $HOSTNAME,    LV swap_1 - 7.1 GB Linux device-mapper (line
     #1             7.1 GB     f  swap      swap
Encrypted volume (sda5_crypt) - 249.8 GB Linux device-mapper (cry
     #1           249.8 GB     K  lvm
SCSI1 (0,0,0) (sda) - 250.1 GB ATA WDC WD2500BEKT-7
     #1  primary  254.8 MB  B  F  ext2      /boot
     #5  logical  249.8 GB      f  crypto    (sda5_crypt)
SCSI5 (0,0,0) (sdb) - 16.0 GB JetFlash Transcend 16GB
    #1  primary    16.0 GB  B     fat32

The last entry is obviously the USB drive I've booted from, but I'm including it for completeness. I may have inadvertently done something to it.

When I try to write changes to disk, I get the following error message

                     [!!] Partition disks

          Identical mount points for two file systems
Two file systems are assigned the same mount point (/): LVM VG
$HOSTNAME, LV root and SCSI1 (0,0,0), partition #5 (sda).

Please correct this by changing mount points.
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This looks like an installer bug, where the installer is misunderstanding what sda5 is used at. I've never encountered that bug with the Debian installer, but maybe Crunchbang got an installer version that happens to have such a bug. – Gilles Oct 21 '12 at 21:32
That appears to be the case. It works fine with the Live-CD graphical installer of the same version (and ISO). – Nate Parsons Oct 22 '12 at 3:06

Burning the ISO to a DVD and installing with that instead solved this (I used ImgBurn).

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