Trying to use nonlinux filesystems such as NTFS or FAT as your root filesystem will result in a broken system.
If you wish to manual set up partitions, as an advanced option you will have to choose which file-system you want. A file-system controls how your files are accessed at lower levels on the disk. If you are booting your computer in UEFI mode a more modern firmware compared to BIOS you will need to create an EFI system partition (see `efi system partition Wikipedia <https://en.wikipedia.org/wiki/EFI_System_partition>`_ for more detail). To create this partition you will need a FAT32 file-system with the ESP flag to be mounted at /boot/efi/ under the mount point. You will also need a root (/) file-system, several file-systems included for Lubuntu are Ext4, XFS, and Btrfs.
If you wish to manual set up partitions, as an advanced option you will have to choose which file-system you want. A file-system controls how your files are accessed at lower levels on the disk. If you are booting your computer in UEFI mode a more modern firmware compared to BIOS you will need to create an EFI system partition (see `efi system partition Wikipedia <https://en.wikipedia.org/wiki/EFI_System_partition>`_ for more detail). To create this partition you will need a FAT32 file-system with the ESP flag to be mounted at /boot/efi/ under the mount point. You will also need a root (/) file-system, several file-systems included for Lubuntu are Ext4, XFS, and Btrfs. Lubuntu 22.04 has bug with installing BTRFS and `This guide on Lubuntu discourse https://discourse.lubuntu.me/t/getting-lubuntu-22-04-to-install-with-btrfs/3273`_
