Replacing Ubuntu 14.04 GNOME GRUB2 with OpenSUSE 13.1 KDE GRUB

Hello! I have a dual boot W7/Ubuntu 14.04 laptop with USB 3 external HD connected into dock-station. In BIOS Setup I have "Legacy MBR" option enabled (not EFI). Windows occupies my laptop's internal HD and Ubuntu lives on the outside disk. I kinda fell in love with YaST and I couldn't find anything similar quality for Ubuntu, so with a heavy heart (I like Ubuntu) I decided to delete Ubuntu and install OpenSUSE 13.1 instead (with KDE dark theme that I prefer over the greenish one of a newer 13.2).
Is anything in particular I should be aware of when installing OpenSUSE in terms of getting rid SAFELY of Ubuntu and replacing its GRUB2 with OpenSUSE's GRUB?
P.S. I can post my "fdisk -l" output if it would help here, but I'm more concerned with OpenSUSE's install and less with Ubuntu, since I'll be deleting it.
Thx!
papakotaAsked:
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ThomasMcA2Commented:
OpenSUSE should be able to handle the installation fine. A year or two ago I installed openSUSE 13 over top of an existing Fedora installation without problems. Even if you do have grub problems, there are several repair tools available: boot-repair (http://sourceforge.net/p/boot-repair/home/Home/), SystemRescueCD (http://www.sysresccd.org/Main_Page) and Rescatux (http://sourceforge.net/projects/rescatux.berlios/) can all repair your boot loader.
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papakotaAuthor Commented:
Thanks for your reply!
I'm familiar with Boot Repair Tool and I used it couple of time to repair Ubuntu 14.04's GRUB2. Do you think it would work to repair OpenSUSE 13.1's GRUB?
I'm not an expert in Linux, so to keep things simple I decided to go with dual boot for now (W7/OpenSUSE). Probably I can just delete Ubuntu first, but then again HOW to do it -- with 3rd party tools from within Windows OR there's another way? Maybe I could do it from within W7's disk manager? Windows sees the Linux partition and can delete them, I think. What do you think?
And another thing is... Should I go with ext4 or btrfs? I heard of a Snapper tool (is it something similar to Windows' System Restore?). Does this tool only works on btrfs?
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ThomasMcA2Commented:
Any boot repair tool that can handle the newer grub2 should certainly be able to handle legacy grub.

Ahhh, partitions. Let me introduce you to gparted, an easy to use GUI tool that runs in almost any flavor of Linux. I have gparted on both a bootable CD and on my multi-boot USB stick.

Lastly, btrfs: MakeUseOf.com, ZDNet.com, and MakeTechEasier.com all give btrfs rave reviews. I've never used it because I was waiting for it to become stable. Well, at some point during one of my recent distro-hops, btrfs became stable. The next time I have to (or choose to) reinstall my beloved Mageia, I will replace my ext4 partitions with btrfs.
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papakotaAuthor Commented:
Thanks again for replying!
I read that btrfs is not so good for MySQL and webservers. And also the question is if older OpenSUSE 13.1's kernel is new enough for btrfs?
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ThomasMcA2Commented:
The kernel version will not matter. According to the btrfs FAQ at kernel.org:

If your btrfs-progs is newer than your kernel, then you may not be able to use some of the features that the btrfs-progs offers, because the kernel doesn't support them.

If your btrfs-progs is older than your kernel, then you may not be able to use some of the features that the kernel offers, because the btrfs-progs doesn't support them.

Other than that, there should be no restrictions on which versions work together.

You may be right about MySQL. A recent article says btrfs can cause fragmentation on database servers, or when using virtual machines. Older articles mentioned performance issues on database servers and with VMs, but those issues have been fixed.

It may still be worthwhile to use btrfs for / and /home, and use a dedicated ext4 partition for databases and VMs.
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papakotaAuthor Commented:
Okay, thanks again for your help! My last question is regarding NVidia Optimus which is better supported in 13.2 version of OpenSUSE. Is there a way to fix that in 13.1? Of course, I could install 13.2, but then I want the old KDE dark theme (not the one which is light green that 13.2 offers)...
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ThomasMcA2Commented:
The owners of this site like to see one question per post, and I've already answered several of your questions. However, if you need video support beyond what the OS provides, then install a separate video driver program. I get mine from here: http://support.amd.com/en-us/download/desktop?os=Linux%20x86_64
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