I want to install Ubuntu 13.10 on 25GB SSD & point /home to a 100GB partition on C:, which will be created after i shrink windows  on disk1. Should i also have EFI partition ? what is that & how to do it ?
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EFI partition is for EFI systems, if you don't have one then you probably don't need one.
 
+Francesco Brozzu I have updated from windows 7 to 8 & then 8.1 ... so i dont have a locked BIOS, but i think windows 8.1 uses EFI bios?  to support dual boot do i need EFI then ?
 
You should already have an EFI partition if you are running Windows 8. If you do, make sure you choose"something else" during the 13.10 install when asked installation method. If you don't it will delete your Windows.
 
/ into 25gb ssd.

/home into the 100gb partition.

/boot/efi into a new partition, 200mb recommended (not less than 100mb), leave as fat32, but select it as EFI boot and let it format as efi. Let this partition into the same disk as your 100gb one for /home

In the installation, before partitioning, tell ubuntu to install the bootloader into the same disk where your /boot/efi resides.
 
If that is an actual screenshot of your partition than there is no EFI partition. Windows 7 didn't need an EFI partition and as such because you upgraded from 7 to 8, windows 8 ended up installing with the standard BIOS.
+Esteban Cuevas I'm pretty sure that in this scenario if you do that, you won't be able to boot into windows anymore. It's worth a try but if I were you since W8 didn't install with EFI, I wouldn't bother trying to install ubuntu with EFI. Just have ubuntu install the bootloader on /dev/sda and grub2 will chainload W8 whether there is an EFI partition or not.
 
Outside of that ... Dual Booting is the way to go =)
 
Not sure what disk management software that is, but that is not Windows disk management. There is no EFI at first sight but Windows 8.1 or 8 will usually make your EFI 300MB in size default. Plus if all your partitions are coming one disk aside from the SSD you might run into problems with to many Partitions, there is of course a maximum you can have. But other then that you should have no problem.
 
is it necessary to have a /home partition at all? you can just install ntfs-config and keep necessary NTFS partitions permanently mounted. So the documents/songs/movies etc can be accessible from both windows and ubuntu. I have no much idea about uefi..but think it is needed only if it uefi type of bios. 
 
Just a thought, if you going to keep your docs/music/movies/pictures etc. on a partition that you are wanting to access between both linux and win, than perhaps you may not want to make /home so large.  If you have the space there is no reason to think twice, but if you plan on using linux for more than just exporting 25 GB may not be enough for the  / mount.  I know the recommended disk space is far less then 25, but after a couple of browsers, IDEs, JDK, SDK etc. it will fill up fast.   unless of course you are going to install your apps & binaries for libs on your /home partition.  but than there may be no reason to separate your /home from rest of your install.  As I don't know your intent and I'm sure you have a good reason to put  /home on a different partition because when I started install with such a layout, I never think twice about trying out some unsupported repo for beta and even alph package.  Reinstall is a walk in the park if you blow up your linux install byond proper boot.  

I guess I was just thinking out loud and saw that if you had 40-50 GB of data on /home and only 10 GB on root / partition, you may be pagin on your SSD but from the flatter disk which may not get the best bang for your buck.  only other thing I would add from past experience is maybe partition out your /swap 2x the size of your RAM, linux will use all the memory you give it.  anyone please feel free to correct me.
 
+paresh suthar thats a good info you have given.. I want to install ubuntu for android SDK, basically i wanna learn building AOKP for android, for some fun time and also windows 8.1 on HDD is slow and huge that i cannot move it to SSD.. So, i decided to use the SSD with ubuntu install, but give /home 100gb to be on a safer side. I think i can use /home to install android sdk so that it wont eat up my SSD space and crash linux.. you comments? 

+Clay Belseck  i have a 200mb system partition and i dont know whats in that.. its shown in the pic as well and i am assuming it belongs to windows.. if that is EFi will there be a special mention ?
 
+phani krishna P I don't know what you are planning on using for the IDE, I'm guessing eclipse may be your choice.  Eclipse does have proven extensions and addons to help with the Android development, so if you are not going to be doing any server side stuff in eclipse - you should try not to install anything you may not need.  With a 25 GB space and 4-8 GB of RAM you should be able to fly through just about any project you would want to put on an Android device.

I would not share a ntfs space between your win and linux os until you get to know the pipeline and know where to catch errors when it comes to permission for files and resolving full path to a wrong file from time to time has kept me up for hours when it was just a capital A and not a.  Remember windows will mess with your chars in your filesystem and linux will not make suggestions on alternative urls and paths to resolve to.

Honestly I would just install all of it on the SSD drive.  Give it a go and you will get going quicker without effecting your windows install (mostly) and keep it from harm, and be able to reinstall linux and your android dev environment quickly - and  this is a good practice to be able to get back to work if your computer get stolen or if you HDD fails.  I like to make sure my personal documents, pictures, music & movies such are not inter twined with my development tools and do my best to separate my dev tools from my dev code, and last but not least keep you resources (images for icons, background, animation, video, statis text) in a separate folder than your code.  no need to have your project build files craw through more than it needs to.  this will speed up your builds, repository checkins and so fourth.  

So knowing now that you intend to use the linux install for developing android projs.  I would not have a 100 GB /home space unless your project is going to have resource to require it!  I don't think a 100 GB or 50 GB proj. apk would go over very well.

good luck on your venture. and one last thing you don't need to or should download every device sim out there.
 
+phani krishna P I have UEFI but i need it because my BIOS needs it, if you have a normal unlocked BIOS you just can't use UEFI, it's not about deciding whether you have to create an EFI partition or not.
 
+phani krishna P That 200MB is what Windows sets up during initial install. A UEFI will say Recovery Partition EFI or UEFI. And I was just looking at how many partitions you have on disk one; do you have 2 disk and the SSD or one disk w/5 partitions and the SSD? Having multiple partitions will kill speed. I use to partition multiple times now I just get another drive. Which is also an option if you have USB 3 you could run Ubuntu or your flavor of linux off of a portable HDD. And good thing you don't have UEFI it is a pain, at least with my machine. 
 
+Clay Belseck +Francesco Brozzu +paresh suthar +Thomas Maincent thank you all for the suggestions.. I have not successfully installed Ubuntu on SSD /dev/sdb with /home on hdd dev/sda.. after installation grub did not load, so I had to install boot repair and reload grub..now it's showing up :-).. coming to my current issue, Ubuntu doesn't seem to allow me to login after connecting to my hotels' Wi-Fi..basically, it connects to the hotel hotspot but doesn't show the login page in Firefox for authentication. Any idea on what could be the issue?
 
trying to open a webpage in nautilus may help get around the issue, but not always.

https://support.mozilla.org/en-US/questions/681968?page=2

and/or

 type in
     'about:config?sprefname=redir'
 in the firefox url text field and you will want to look over things that have redirect or something about unsafe redirect, can't remember but it's a security setting set to tight - haven't used firefox for years. give chrome a try! not affiliated with them btw.
 
+Francesco Brozzu ping returns "destination host unreachable" 100% packet loss.. it's obvious because I'm only connected to the hotspot but need to login with username in browser to get internet access
 
+Clay Belseck I'm connected to the same network on my phone and Windows... it's just that Ubuntu is not able to recognize and show me login with browser... I have checked browser setting for redirection to warn me, proxy tried both enabled and disable other than automatic! This issue was totally unexpected :-P
 
+Clay Belseck any specific version you suggest? I have always installed only from Ubuntu software center..so if I download, is it like a zip file which I need to extract somewhere in the /bin?
 
+Clay Belseck same issue with chromium as well :-(... this issue is really cutting me down, but I'm glad and really happy that I have some support and people helping me solve it !
 
+phani krishna P Best bet ask the front desk for the homepage to the wifi login. Also you could try IE tab for Firefox it is an add on you can get, allows your page to think it is open in IE . My good guess if it is not working with Chrome or Firefox it is possibly scripting related. 
 
+Clay Belseck   plz have a look at http://www.flickr.com/photos/106653179@N08/10508034496/

i m loading the homepage ip address directly.. but it takes ages to show this login request and then after entering credentials, it keeps loading forever !! can it be an issue with network manager or something else choking the adhoc req? 

i tried to share my mobile hotspot and open the same login page.. it loads up quick and easy.. screenshot http://www.flickr.com/photos/106653179@N08/10508169446/

I hope this gives you more idea of what is happening :) 
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