Installing Ubuntu on a Toshiba laptop with Windows 8

[Jim Byrnes]

In another thread I discovered that only the latest version of Ubuntu 
would run on this machine.  So I decided to install the 13.10 beta. 
After loading the live DVD I ran the install program.

Because I have not setup or activated Windows 8 the installer said it 
detected no other OS's and offered to use the whole disk or do a manual 
partition.  Since I want to keep Windows8 I choose manual.

Here is how the installer sees the hard drive:

Device         Type      Size      Used
/dev/sda
free space               1MB
/dev/sda1      ntfs      1073MB    375MB
/dev/sda2      efi       272MB     50MB
/dev/sda3      ntfs      134MB     14MB
/dev/sda4      ntfs      486755MB  unknown
/dev/sda5      ntfs      11870MB   10966MB
free space               0MB

Earlier when I looked at the disk with gpartd it put a warning on sda4 
that said:  "Unable to read the contents of this file system! Because of 
this some operations may be unavailable."

It's been a long time since I have done any manual partitioning so I am 
feeling a little apprehensive.  I've read some howto's but many of them 
are old and contradictory. Some of the newer ones say you must create 
and efi partition for Ubuntu and others say to use the Windows one, so I 
am getting confused.

I know you can only have 4 primary partitions.  I don't see anything 
that tells me what those listed above are but I assume they are all 
used. So I guess I need to shrink sda4 and then create 2 logical 
partitions in the free space created?

I was thinking:

Windows = 136755MB
/       = 345000MB
swap    = 5000MB  (laptop has 4GiB)

Any guidence is appreciated.

Regards,  Jim