Windows 10 and Ubuntu Dual Boot

Hi All,
I have 2 Hard Disk, 2 TB and 1TB. I have Win 10 on the bigger 2 TB disk and had Win 7 on the Second Disk as a second boot. but as of late since I have upgraded, yesterday whole day my machine gave me many problems... I had to Rebuild BCD many times and now its stable...

The second Disk was not showing at all... I thought maybe its problem as it has win 7. Now I have removed the Win 7 and have only Win 10 on the 2TB disk.

I wanted to install Ubuntu on the 1TB disk (I want it as a fail safe if my win10 gives some problem - I can at-least boot in Ubuntu and access the net to search for a solution)

Can someone help me in this and also if will I have the dual boot option screen where I can choose to boot with win or Ubuntu.
Thanks,
Prasadh
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Prasadh BaapaatWeb Designer & DeveloperAsked:
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rindiCommented:
You don't have to install an OS to boot the PC to be able to search for solutions. Most Linux Distro's come as Live Media, including Ubuntu, The Live Media is the same as what you would use to install the OS from. For example You can put your Linux Distro on a USB stick and boot to it, and then you can use it right away without installation to search for solutions. Personally though I wouldn't recommend ubuntu, as it's Unity user interface is terrible and resource hungry. There are much better distro's around for this, like PCRepix (which is based on Ubuntu/MakuluLinux) as it is low on your resources and very fast, looks very good, has plenty of software installed which you can use right away in live mode:

http://pcrepix.sourceforge.net

If you really need to, you can still install it, as it has an installer. You would probably have to first disable secureboot on your PC. When you get to the partitioning option, be sure to select the proper disk, and when you select where to install GRUB, the boot loader, select the disk your Windows is installed on. It should then recognize your current OS and add it to the GRUB boot menu.

But be sure that you first backup your current system. Also, Linux generally doesn't need a lot of space, 1TB is far too much. It would fit nicely to a 10GB partition or so. So you wouldn't even have to install it to your 2nd disk. I'd probably just shrink the partition on your main disk by 10 or 20 GB, then create a new partition in that space where you would install Linux to.
Prasadh BaapaatWeb Designer & DeveloperAuthor Commented:
Hi Rindi,
Thanks for the useful Info you gave.
But I want to install it on the 1TB disk which has 2 partitions of 240GB and 691GB. About Ubuntu not that good... well I just downloaded a1.7 GB installer and wrote it on a DVD :(

can I directly double click the installer and install it on my Drive H:  

OR

I have to restart the machine with the disk in cd-drive and it will boot like the win installer disk.

thanks,
Prasadh
Prasadh BaapaatWeb Designer & DeveloperAuthor Commented:
some additions:

The Drive H: is the 240 GB part of the disk...  so now Win 10 will be on Drive C: and Ubuntu on H: (both on separate hard disks) will I be able to have Dual boot?
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rindiCommented:
Restart the PC booting from the DVD. You won't have "Drive H:" in Linux, but rather something like "sdb1", "sda1", "sdb2" etc, where "a", "b", "c" etc represents disks 1, 2, 3 etc, and "1", "2", "3" etc represents partitions 1, 2, 3 and so on.

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rindiCommented:
As long as you select to install GRUB to the correct disk (the installer gives you that selection, or should), you should have dual boot using Ubuntu's GRUB boot loader as primary boot loader (not the one that comes with Windows).

A disadvantage is that Windows can overwrite the boot loader at times, resulting in GRUB disappearing in which case you'd have to reinstall GRUB to get Ubuntu back into your boot options.

Also, I have only dual booted Windows and Linux using MBR disks and conventional BIOS, not GPT disks and UEFI BIOS like you probably are, so I'm not sure if everything works out as expected, although it should. But this is one reason I suggest making a backup before starting.
Prasadh BaapaatWeb Designer & DeveloperAuthor Commented:
got it...  think I should dive in and install it... will give the feedback after some time.
Prasadh BaapaatWeb Designer & DeveloperAuthor Commented:
Hi Rindi,
I tried out installing Ubuntu... here is feedback:

When machine booted I got 2 options 1) Check Trial 2) Install Ubuntu - I selected Install Option.

I went till the select Drive to install stage (The drives were named as "sda1", "sdb2" etc as you said)
But when I selected the appropriate drive and clicked install I received a popup window with a message:
"No root file system is defined"
"Please correct this from the partitioning menu" - the selected drive is ntfs

I did not know what partitioning menu is and I quit at that stage. but a good thing is that after I said Quit, A Trial Working version of Ubuntu opened and I was able to open Firefox and Browse.

so The good thing in this is that I feel I can use this DVD whenever I have problem with windows and boot thru DVD and use firefox to search for solutions.

I was not able to check my other drives or see content on them as a long warning message showed when I clicked on say drive "sdb2" it said could not mount something something... use option "ro"...

the message was quiet long and I did not write it down.

will I be able to see contents of all drives when I load Ubuntu in a trial mode?

thanks,
Prasadh
Prasadh BaapaatWeb Designer & DeveloperAuthor Commented:
yes and when I exit Ubuntu and remove DVD... I can properly boot to Windows and my win 10 stars correctly without any problem.
rindiCommented:
I don't know the ubuntu installer by heart so I'm not absolutely sure what you have to select where. The best thing is that when you install it, that you have an unpartitioned space on your disk where you install the OS to, that works best.

Since you can use live mode, I still suggest to not install Ubuntu, as that doesn't change anything on your HD, you don't risk anything, and you still have a fully functional Linux that you can use.
Prasadh BaapaatWeb Designer & DeveloperAuthor Commented:
Yes my problem has been solved as of now with Live mode... I can access internet in case of emergency. So I am not installing Ubuntu as of now ... maybe later when I want to learn more about it.

Thanks for your inputs.
Prasadh
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