Changes within the Proxmox VM UI

  1. Shutdown VM
  2. Go to VM
  3. Go to Hardware
  4. Select Hard Disk
  5. From the top nav, select Disk Action then Resize
  6. Enter the amount you want to increase the disk by
  7. Start the VM

Changes within the Ubuntu VM

  1. ssh into VM
  2. run cfdisk (free space should be available)
  3. select disk to resize
  4. select Resize and Enter
  5. select Write and Enter
  6. hit Q to quit
  7. Run sudo resize2fs /dev/vda2 (replace /dev/vda2 with correct disk name)
  8. Confirm changes by running df -h