I have a 500 GB H.D.D and I dedicated it all to Ubuntu before .
But later I needed Windows 8 , I couldn't install it and created a thread in which I was told I can't install Windows 8 After Ubuntu :
Now I need some music and video creation softwares both in Windows and Linux and I'm trying to install UbuntuStudio after Windows 8 , but whatever I do I can't see the option "Install UbuntuStudio alongside Windows" .
And when I choose "Something else" or open GParted , I see the whole 500 GB is marked as unallocated (in live mode) , BUT I can see my 250 GB Windows Volume there . (I kept the other 250 GB for UbutnuStudio)
Also when I open GParted this notification appears :
It doesn't matter whether I choose Yes or No , It still shows the whole H.D.D as unallocated ./dev/sda contains GPT signatures, indicating that it has a GPT table. However, it does not have a valid fake msdos partition table, as it should. Perhaps it was corrupted -- possibly by a program that doesn't understand GPT partition tables. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Is this a GPT partition table?
My Windows 8 hasn't UEFI firmware , but my motherboard supports it . I tried both UEFI and legacy mode , I still couldn't see the "Install alongside ..." option .
Also , I did try everything google search results in ubuntuforums and askubuntu and official documentations (including UEFI and SecureBoot) believe me , none of them worked .
Don't give me link to other solutions , I tried all of them and am trying this installation for 2 days and have booted UbuntuStudio live for more than 20 times with different settings . Also installed Windows 8 three times with 3 different hard allocation .
+ I have nothing important in my H.D.D , if I need to format the whole H.D.D let me know , that's possible .
If any furhter information is needed tell me .