This script automatically expands the root LVM disk in a Debian/Ubuntu virtual machine after increasing the disk size in your hypervisor or control panel.

expand-lvm-disk resizes the last partition on /dev/sda, updates the partition table, resizes the LVM physical volume, extends the root logical volume, and grows the filesystem (ext4 or xfs). It also reduces reserved blocks on ext4 filesystems to 1% to maximize usable disk space.

• Debian 10/11/12 or Ubuntu 18.04 or later.
• Root filesystem on LVM in the last partition of /dev/sda.
• Root privileges.

1. Increase the size of your VM disk in your hypervisor/control panel.
2. Upload the script to your VM.
3. Make it executable:

   chmod +x expand-lvm-disk

4. Run the script as root:

   sudo ./expand-lvm-disk

5. Verify the new disk space:

   df -h

• Only works with /dev/sda where the root filesystem resides on LVM in the last partition.
• Does not support complex partition layouts, multiple disks, encrypted volumes, or separate non-LVM root filesystems.
• Always create a backup before modifying disk partitions.

Use this script at your own risk. The author assumes no responsibility for data loss or system issues resulting from its use.