‘No Root File System is Defined’ When Installing Ubuntu [Fixed]




You are reading this because you probably received the error message “No Root File System is Defined” during Ubuntu installation. This guide provide a quick fix.

No Root File System is Defined

What Causes “No Root File System is Defined” Error?

The error message will come up when you are installing a Ubuntu or other Linux distributions. I once received this error when I was installing Ubuntu.

This may be caused by any of the following:

  1. You have not created a valid Linux partition
  2. You are trying to use a Windows partition (FAT or FAT32) to install Ubuntu
  3. A Linux partition exists but you have NOT defined the root partition (“/”)

Fix for “No Root File System is Defined” Error

Follow the steps below to fix this error message and continue your Ubuntu Linux installation.

Below are the solutions:

Method 1 Fix for “No Root File System is Defined” Error: Create a Linux Partition and Assign a Root Partition

Follow the steps below:

  • On the Installation type page, select a free partition. Then click the + sign to add a partition.
No Root File System is Defined
  • When you click the + sign, the Create partition window will load.
No Root File System is Defined
  • On the Create partition window configure the following:
  1. On the Size field, the default will be the full size of the partition. Enter a value here in MB.
  2. Then select the type of partition, Primary or Logical partition.
  3. On the Location for the new partition, select Beginning of space or End of space.
  4. Next, select a file system. I selected the default, Ext4 journaling File system
  5. Finally, select a Mount point. The Mount point drop-down shows the following options:
Ubuntu Mount points
For a root partition, select /.
  • When you finish, click Ok.
No Root File System is Defined

Method 2 Fix for “No Root File System is Defined” Error: Delete Existing Windows Partition

If you received “No Root File System is Defined” Error because you selected a FAT32 or FAT file system, you have to delete it. When you delete the partition, it will appear as a free partition. You can then use the steps in the last section to re-create the partition.

You may also modify the partition. Details later in this section.
  • To delete a partition, right-click it and select Delete.
  • You may also select Change to change the file system to a Linux file system.
  • When you click Change, the highlighted part of the image below will load. To change the file system to a Linux file system click the Use as drop-down. Select a file system. Then click Ok.

Method 3 Fix for “No Root File System is Defined” Error: Define a Root Partition

The “No Root File System is Defined” error may still occur if you have a partition but did not define a root (/) partition.

If there is no root mount point, no partition will have the / as mount point. See the image below.

To fix this:

  • Right-click on the partition you wish to use as root and select Change. You may also double-click the partition.
  • When Edit partition option opens, beside Mount point click the drop-down and select /. Then click Ok.
You should now be able to continue with your Ubuntu installation. Select the partition you created, check the Format? column. Then click Install Now.


One of the solutions suggested in this guide should fix this error. If you have any question or comment use the “Leave a Reply” form at the end of this page.

Alternatively, you could share your experience so that other readers can benefit from it.

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