Installation Issues

Partitioning Options

When dual booting Windows and Ubuntu, the easiest option is to choose to "Install Ubuntu alongside Windows".
If you want to manually partition the installation, choose "Something else" at the bottom.

If you're using UEFI, you'll need to make a 300MB FAT32 partition and select it as the EFI partition. If dual booting, select the Windows EFI partition as the EFI partition instead.
If you're using CSM Legacy (BIOS) with a gpt partition table, then you'll need to make a 1MB empty partition with the type "BIOS Boot partition".
If you're using CSM Legacy (BIOS) and a msdos partition table, then you won't need to create anything for booting.
At the bottom of the screen, choose the disk where the Ubuntu installation is going to be installed, e.g /dev/sda or /dev/sdb etc. for the "Bootloader location"

You'll need to create a root filesystem where the installation goes.
20GB and more is a good size. The mountpoint should be selected as "/" and the filesystem type as "ext4".

You'll also need a swap partition. If you're going to use hibernation, then the swap partition has to be at least as large as your RAM.
if you have 4GB ram, make a 4GB swap partition. The type of the partition should be "swap".

Installer Issues

Sometimes the installer fails to install grub, the bootloader. If it does so, you can start the installer from a terminal by pressing Ctrl + Alt + T and typing ubiquity -b and it will not install the bootloader.
You can later chroot into the install and manually install it. Click here on How to Reinstall Grub.

RELATED TOPICS
Live USB, Ubuntu, Booting, Partition table, Partitions, BIOS, UEFI