Setup Your Disks
You will want to verify you have at lease 400gb avaiable on your machine using df -h. Here you see 940G in my / mount point on drive /dev/sdc/. The Ubuntu installer will default to 100G and leave much of your space unused unless you tell it what to do.
If your machine has 2 Disks, we want to separate the Ledger to the larger disk.
NOTE: if you change ledger to a separate drive, you will need to modify your Ledger Dir in other commands and locations later in the guide.
Process to mount a new directory:
Run lsblk to see your storage devices on your system
If you have a drive not being used, you can run sudo mkfs -t ext4 /dev/sdd but adjusting for your device name.
Then you can make your ledger dir in some folder such as sudo mkdir -p /mnt/ledger
And change ownership to your non-privledged user sudo chown -R xand:xand /mnt/ledger
And then mount it to your spare device sudo mount /dev/sdd /mnt/ledger
Now anything you put in the /mnt/ledger directory will be held in the additional drive (possibly a faster nvme drive).