The "Something else..." option is the way to go. Use this to delete the Windows partitions and ignore the partition you wish to keep.
In the "free space", create two partitions:
EFI System Partition that's about 500 MB.
Ext4 journaling file system partition with the mount point / using the remaining space.
Then click "Install Now".
A swap partition isn't required, unless you wish to use Hibernation. Ubuntu will set up a swap file by default. This makes it flexible to make swap adjustments later without dealing with partitions.
If you need to make adjustments after installation:
That s the greatest tip i have read.
That for compatibility issues with uefi and not uefi installation on hhd - ssd.
I have an issue trying to fix grub problems (i have no acces to bios setup [F2]either booting setup [F11]) with hdd non uefi installation with (usb-iso) grub-resque and got this message
I apologize, I meant that to be a general query toward everyone, not just to you. Message boxes in Ubuntu MATE continue to be either taller or wider than they should be, since certain boxes appear to include a line break only when the box hits the maximum width of the display or break on every word like the example you showed.