I am installing Linux on Virtual Box but it says that the computer currently has no detected Operating Systems. What would you like to do?
1) Erase disk and install Ubuntu
Warning: This will delete any files on disk.
What should I do?
Ubuntu – What does it mean for Linux to erase disk space in Linux
system-installationubiquity
Related Solutions
Ha!! Thanks a lot for this answer! When I wanted to install Ubuntu 13.04 alongside Windows 7, I had the same problem - Ubuntu's installation wouldn't recognize that Win 7 was installed, so it never offered the possibility to install Ubuntu alongside Windows.
Trying to troubleshoot, GParted recognized the HD as 1 non-allocated space. This is even though Ubuntu 12.10 was installed (but corrupted because of an update, which was the reason for upgrading to 13.04 in the first place...)
Bottom lines:
By using Window 7's diskmgmt.msc I recreated free space where Ubuntu 12.10 was originally installed.
I ran the 13.04 installation - and boom! Ubuntu recognizes Windows - I see the option to "Install Ubuntu alongside Windows 7". FYI, Ubuntu installation overtook all the un-allocated disk space automatically, and also allocated SWAP space.
When rebooting I faced another problem - instead of Ubuntu 13.04, I was still seeing Ubuntu 12.10... This was clearly a grub problem.
To solve this problem, I used the default instructions for BootRepair: Found here: https://help.ubuntu.com/community/Boot-Repair
5. Hallelujah !! ;)
Disable UEFI boot support . Now try to install again.
If not working follow these steps...
Shrink your Windows partition
Windows takes up the whole of the drive when it is first installed. In order to install Ubuntu you will need to make space for it.
Press the "super key" (Windows key) on your keyboard and click the magnifying glass in the top right corner. In the search box start typing "Partitions".
Click on the option called "Create and format partitions". This will bring up the "Disk Management" screen.
To shrink the drive, right click on the "OS (C:)" volume and select "Shrink volume".
A screen will appear showing how much you can shrink the drive by. You can of course choose to shrink the drive by less than offered but never go for any more than offered as you will break your Windows 8.1 operating system if you do.
Click "Shrink" to continue.
When you are finished you will see that there is a lot of unpartitioned space. This is where Ubuntu will be installed.
Turn off fast boot
Turn off secure boot
Install Ubuntu
for installation guide here
If not working refer here to install manually.
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Best Answer
This is rather by design. You're inside a virtual computer. The disk that the Ubuntu installer can see is a virtual disk created and hosted by VirtualBox. In reality it's just a file sitting around on the host filesystem.
When VB creates a new one of these disks they have no partitioning and no filesystems or files. The Ubuntu installer is just echoing this state.
What should you do? Format and install.