Fixing "Can't overlap overlapping partitions" Errors while Resizing Disk in Proxmox Ubuntu Client

When increasing the disk size of a virtual machine in Proxmox while using the Ubuntu Client, you may encounter an error stating "Can't overlap overlapping partitions". This article will guide you through the process of resizing the disk, including detailed explanations of key concepts and solutions to common issues.

Prerequisites

Before proceeding, ensure that you have the following:

• A Proxmox VE installation with a virtual machine
• Increased the disk size in Proxmox VE for the virtual machine
• Ubuntu Client installed in the virtual machine

Key Concepts

Partitioning

Partitioning is the process of dividing a hard drive into one or more logical storage units. Each partition can be formatted with a specific file system and mounted at a particular point in the system.

Disk Resizing

Resizing a disk involves increasing or decreasing the size of a partition or logical volume. This operation is useful when allocating more space to a system or optimizing storage usage.

GParted

GParted (GNU Partition Editor) is a free and open-source partition editor for graphically managing disk partitions.

Procedure

After increasing the disk size in Proxmox VE, follow these steps to resize the disk in the Ubuntu Client:

1. Boot the Ubuntu Client virtual machine.
2. Install GParted using the following command:

sudo apt-get update
sudo apt-get install gparted

3. Launch GParted:

sudo gparted

4. Identify the disk to be resized by matching the size and partition layout.
5. Find the partition that needs resizing (most likely the largest one occupying the old disk size).
6. Right-click on the partition and choose "Resize/Move".
7. Adjust the new partition size to occupy the entire disk, including the newly allocated space.
8. Apply the changes by clicking "Apply" or "Check for errors" to fix any issues before resizing.

At this point, you might encounter the "Can't overlap overlapping partitions" error, which can be resolved by deleting and recreating the affected partition.

Fixing "Can't overlap overlapping partitions" Errors

1. Right-click the affected partition and choose "Delete".
2. Right-click the unallocated space and choose "New".
3. Set the file system, label, and partition type according to your needs.
4. Adjust the size to match the new disk size (or use the default "Max" option).
5. Position the partition to start at the beginning of the unallocated space.
6. Click "Apply" to finalize the changes.

Resizing a disk in Proxmox VE with an Ubuntu Client involves increasing the disk size in Proxmox followed by resizing the partition in Ubuntu using GParted. Potential issues such as overlapping partitions can be resolved by deleting and recreating the affected partition. Be sure to double-check and confirm the changes before applying.

References

• Proxmox VE: Resize disk of a running virtual machine
• GParted Home Page
• Ubuntu Server Documentation: Manage Partitions