How to fix Error starting daemon: error initializing graphdriver: aufs not supported over overlay in Docker

# Check daemon.json for explicit storage driver setting
cat /etc/docker/daemon.json 2>/dev/null

# Check systemd service overrides
systemctl cat docker.service | grep -i storage

# Check for AUFS directories from old installation
ls -la /var/lib/docker/ | grep -E "(aufs|overlay)"

# Check filesystem type for Docker data directory
df -T /var/lib/docker

# Or check the mount options
mount | grep -E "(/var/lib/docker|overlay)"

# Check if overlay module is loaded
lsmod | grep overlay

# Stop Docker service
sudo systemctl stop docker
sudo systemctl stop docker.socket

# Backup existing Docker data (optional but recommended)
sudo cp -a /var/lib/docker /var/lib/docker.backup.$(date +%Y%m%d)

# List existing images and containers for reference
# (This won't work if daemon isn't running, but try anyway)
docker images 2>/dev/null > ~/docker-images-backup.txt
docker ps -a 2>/dev/null > ~/docker-containers-backup.txt

# Create or update daemon.json
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<EOF
{
  "storage-driver": "overlay2"
}
EOF

sudo nano /etc/docker/daemon.json

# Remove AUFS-specific directory
sudo rm -rf /var/lib/docker/aufs

# Optionally, for a clean start, remove all Docker data
# WARNING: This deletes ALL images, containers, and volumes!
# sudo rm -rf /var/lib/docker/*

# Reload systemd configuration (in case of changes)
sudo systemctl daemon-reload

# Start Docker
sudo systemctl start docker

# Verify Docker is running
sudo systemctl status docker

# Check the storage driver
docker info | grep -A5 "Storage Driver"

Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true

# Pull your required images again
docker pull nginx:latest
docker pull postgres:15
# ... pull other images you need

# If using docker-compose, simply run:
docker-compose pull
docker-compose up -d

# Run a test to verify everything works
docker run --rm hello-world