Fix: No Root File System is Denied in Ubuntu

Hello, No Root File System Is Denied is an Error message which usually shows up during the installation of Ubuntu. Nowadays a lot of users are getting this error message during the installation of Ubuntu or other Linux distributions. If you are also facing this issue don’t worry its usual and can be fixed with the proper guidance.

So here in this, we have prepared the Fixes to help you fix this issue and the causes for this error message, it will help you prevent yourself from getting this error message again.

Let’s Begin:

Cause of this Error?

As we know that the error message of “No Root File System Is Denied“usually shows up during the installation of Ubuntu or other Linux distributions. Now the question comes why?

Following are the things which might be causing this issue:-

  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 (“/”)

Now after knowing the cause for the error message of “NoRoot File System Is Denied”. let’s get to the main thing, How to Fix it. So just scroll it down and your issue will be fixed.

How to Fix “No Root File System Is Denied” Error

Here we have prepared the simple and working methods which will help you fix the Error “No Root File system Is Denied”:

Method 1. Create a Linux Partition and Assign a Root Partition

If you are the one facing this issue then the cause for your issue might be that you have not created a valid Linux partition. So if you have no idea how to create a Linux partition. Then don’t worry we have given the step by step guide below

here are the steps to create a Linux partition and Assign a root partition:

Step 1: First, of all On the Installation type Window, choose a free partition. and click the + sign to add a partition.

(After you click the + sign, the Create partition window will get open)

Step 2: Once the Create partition windows get open just follow the below instruction:

  1. On the Size field, the default will be the full size of the partition. Enter a value here in MB.
  2. Now 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. We recommend selecting the default, Ext4 journaling File system
  5. Now at the end, select a Mount point. The Mount point drop-down shows the following options:

  • Once you finish, click Ok.

Method 2. Delete Existing Windows Partition

If your Error is still not fixed then the cause of your error might be different. It could be that you have selected a FAT32 or FAT file system, So now, in this case, you have to delete it. Once you delete the partition, It will appear as free again. Then you can follow the steps given in above method to create the Linux partition.

In case you have no idea How to Delete the Existing Windows Partition just follow the instructions given below:

  • To delete a partition, Do right-click and select Delete.

  • You can also select Change to change the file system to a Linux file system.

  • Now When you do click on Change, the highlighted part of the image below will load. To change the file system to a Linux file system click the Use as a drop-down. Select a file system. Then click Ok

Method 3. Define a Root Partition

If your error is still not fixed with the above method. then there might be chances that the cause of your issue was different.

The “No Root File System Is Defined” error may still Not fixed 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 a mount point. See the image below.

Follow the steps below to fix it:

  • Firstly do Right-click on the partition you want to use as root and select Change. You can also double-click the partition.
  • Once the Edit partition option opens, beside Mount point click the drop-down and select /. Then click Ok.

So now your error should be fixed and you’ll be able to continue with your Installation. Select the partition you created, check the Format? column. Then click Install Now.


I hope your installation is now completed without getting interrupted by the error “No Root File System Is Denied”. One of the Methods above should have fixed your issue.

In case your issue is still not fixed then you might have not performed the methods properly or you forgot the instructions.

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