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.
sda5is 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.