Mount a BitLocker encrypted (Windows) drive using 'dislocker' - Created and tested on Ubuntu 20.04

mount_bitlocked_windows.sh

# Mount a BitLocker encrypted (Windows) partition

### SET THESE VALUES

# Set either(!) BITLOCKER_RECOVERY_KEY or BITLOCKER_USER_PASSWORD used to unlock drive
BITLOCKER_USER_PASSWORD=
BITLOCKER_RECOVERY_KEY= # e.g. 123456-123456-123456-123456-123456-123456-123456-123456

# The drive to mount (where Windows is located)
WINDOWS_PARTITION=/dev/nvme0n1p4  # Or /dev/sda4

### END: VALUES



### Mount points
BITLOCKER_MOUNT=/media/bitlocker  # Temp mount point for `dislocker`
WINDOWS_MOUNT=/media/windows  # Mount point of unlocked Windows partition


### Assert setup

# Assert dislocker is installed
if ! hash dislocker 2>/dev/null; then
    echo "ERROR: dislocker not found. Install on Ubuntu with 'sudo apt install dislocker'"
    exit
fi
# Assert either BitLocker recovery key or user password is set
if ! [ "$BITLOCKER_RECOVERY_KEY" ] && ! [ "$BITLOCKER_USER_PASSWORD" ]; then
    echo "ERROR: Neither BITLOCKER_RECOVERY_KEY nor BITLOCKER_USER_PASSWORD is set."
    exit
fi


### Preparation

# Elevate to root
if [ ! $EUID = 0 ]; then
    sudo "$0" "$@"
    exit $?
fi

# Check if dirs / mount points exist
if [ ! -d "$BITLOCKER_MOUNT" ]; then
    echo "Creating dir of moint point for BitLocker"
    mkdir --parents $BITLOCKER_MOUNT
fi

if [ ! -d "$WINDOWS_MOUNT" ]; then
    echo "Creating dir of moint point for Windows"
    mkdir --parents $WINDOWS_MOUNT
fi


### Mount

# 1. Mount BitLocker to file (with recovery key)
if [ $BITLOCKER_RECOVERY_KEY ]; then 
    echo "Mounting BitLocker unlocked with BITLOCKER_USER_PASSWORD..."
    sudo dislocker -r -V $WINDOWS_PARTITION --recovery-password=$BITLOCKER_RECOVERY_KEY -- /media/bitlocker
elif [ $BITLOCKER_USER_PASSWORD ]; then 
    echo "Mounting BitLocker unlocked with BITLOCKER_USER_PASSWORD..."
    sudo dislocker -r -V $WINDOWS_PARTITION --user-password==$BITLOCKER_USER_PASSWORD -- /media/bitlocker
else
    echo "Neither BITLOCKER_RECOVERY_KEY nor BITLOCKER_USER_PASSWORD is set."
    exit
fi


# 2. Mount BitLocker file to Linux drive
echo "Mounting Windows..."
sudo mount -r -o loop /media/bitlocker/dislocker-file /media/windows/

See Open Bitlocker Drive on Linux >> Step 6 – Creating a Script to automatically Mount the locked Drive [Ceos3c.com] how to auto-mount the BitLocked drive at startup