Why do I have so much available space on d drive and a teeny amount on (c:)?

You should be able to install Ubuntu to the d drive. If you have a lot of space available here, this should not be a problem.

I'm assuming you're starting with Windows.

When you install Windows and install all your application programs, they usually don't even know you have a D drive. So they tend to store all their data on the C drive, just by default. The D drive only gets used when you specifically decide to put data there or move it there.

What you want to do is look through your C: drive to see what data there is that could be moved over to the D: drive. This includes 'documents', MP3s, old e-mail, etc. etc.

You might also consider getting a bigger C: drive. You can get a terabyte now for like $60, and you will NEVER fill that up unless you're a compulsive downloader of movies and MP3s like I am, and then it would take several years. You can split off a partition of, say, 100 gigs for Ubuntu and you'll never miss it, and Ubuntu will have all the room it needs to grow.

you may delay C, even although you will could desire to delete D to do it. After extending C even although plenty you decide on you need to create a clean D with the the rest unallocated area. so which you will could desire to back up what's on D till now than messing with the partitions. This all assumes that bodily D is after C on the flexibility. which you will easiest delay in the direction of the middle of the puzzling ability.and you may easiest delay into unallocated section (by way of fact of this you may desire to delete D first). Use Disk administration in living house windows to try this. Why no longer purely circulate some records to D to liberate living house on C. you're no longer waiting to circulate connected applications even although which you would be waiting to circulate stuff like video clips, music, photos, and so on.

I don't know why you should not use some of D. You can make a GRUB boot record on C MBR that points to a chain loader on D, or to a kernel on D (/dev/sda, /dev/sdb2 or whatever). Or an MBR on D and then switch at BIOS boot and leave C alone.

Delete system32, it's the ONLY way!