Am i able to install ubuntu first and then install windows? I allocated ubuntu 15gb and im going to load the rest (900gb) for windows but will grub loader work? Or do i have to install windows first and then ubuntu? Thanks
Ubuntu – Install Ubuntu first before installing Windows for dual boot
dual-bootsystem-installation
Related Solutions
There is no way to fix the windows 7 bootstrap from Ubuntu, you will need to do so with the windows 7 DVD but, which size is sda1, if it is +/- 100Mb, you should not have much troubles fixing it but, will need to reinstall grub to another partition. If it is way bigger than 100Mb, this mean it was not the system reserved space and that you have installed Grub over your windows 7 thus, deleting windows 7 completly....
The way Ubuntu should be set up by default in dual boot mode is that you will see a menu for some seconds to choose the OS from.
Shown here for 10.04 LTS and Windows XP but similar in later releases
If you don't see it, make it visible by pressing and holding the left SHIFT key while booting.
In case you look for a way to reboot into Windows see this question.
For a way to reduce the time until Grub loads the default entry see this question
To change the default boot entry have a look at this answer
Best Answer
Though you can technically install Ubuntu and Windows in any order, I would highly recommend that you install Windows first. This is because installing Windows on top of Ubuntu will likely result in messing up the MBR. When that happens, it can be very difficult to boot into Ubuntu, because the Grub dual-boot menu might disappear. It can be a little tricky recovering from that, which you can read all about here:
https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows
So if you have the opportunity to start from scratch, installing Windows first and Ubuntu second could potentially make your life MUCH easier.