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Fixing “Failing to Unmount /cdrom” Error When Dual-Booting Ubuntu and Windows 10

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When setting up a dual boot system with Ubuntu and Windows 10, you may encounter an error message that says “Failing to unmount /cdrom”. This issue can be frustrating, but it’s not insurmountable. In this article, we’ll walk you through some potential solutions to this problem.

Understanding the Error

The error message “Failing to unmount /cdrom” usually appears during the Ubuntu installation process. It indicates that the system is unable to unmount the CD-ROM drive. This can occur due to a variety of reasons, including issues with the installation media, partition format, BIOS settings, and more.

Verifying Your Installation Media

The first step in troubleshooting this issue is to ensure that your installation media is properly created and verified. You can use tools like Rufus to create a bootable USB stick. If your installation media is corrupted or improperly created, it can lead to various installation errors, including the failure to unmount /cdrom.

Checking Your Partition Format

Ubuntu cannot be installed on a FAT32 partition. You need to ensure that you have a separate partition formatted as NTFS or ext4 for the Ubuntu installation. You can use the Disk Management tool in Windows to check and modify your partition format.

Disabling Fast Startup and Hibernation in Windows

Fast startup and hibernation features in Windows can interfere with the Ubuntu installation process. To disable these features, navigate to the Power Options in Windows, choose “Choose what the power button does”, and then “Change settings that are currently unavailable”. Under “Shutdown settings”, uncheck the boxes for “Turn on fast startup” and “Hibernate”.

Checking Your BIOS Settings

The drive with the Ubuntu installation media should be set as the first boot option in your BIOS settings. To access your BIOS, restart your computer and press the appropriate key (usually F2, F12, DEL, or ESC). Once in the BIOS, navigate to the Boot tab and set the boot order accordingly.

Turning Off Secure Boot

Some systems may require you to disable secure boot in the BIOS settings before installing Ubuntu. Secure boot is a security standard developed by members of the PC industry to help make sure that your PC boots using only software that is trusted by the PC manufacturer. However, it can cause issues with dual boot setups.

Updating Your UEFI Firmware

If you are using UEFI, it is recommended to update your firmware to the latest version to ensure compatibility with Ubuntu. You can usually find the latest firmware updates on your PC manufacturer’s website.

Verifying Disk and Partition Information

Boot from the LiveUSB and open a terminal. Run the following command to gather information about your disks and partitions:

sudo lshw -short -C disk ; lsblk | grep -v loop ; df -h | grep -v loop ; sudo blkid ; dmesg | grep '/dev/sd' ; dmesg | grep '/dev/nvm'

This command will provide a detailed list of your disks and partitions. If you need help interpreting the output, consider seeking help from the Ubuntu community forums.

Disabling CDROM Source

You can also try to comment out the CDROM source from the /etc/apt/source.list file by opening a terminal and typing:

sudo nano /etc/apt/sources.list

Then, find the line that refers to the CDROM and put a # at the beginning of the line to comment it out. Save and exit (CTRL+X, then Y, then ENTER). Also, disable any CDROM checkboxes in the “Software & Update” settings.

Ensuring Proper Disk Space

Ensure that you have enough free disk space on the partition where you want to install Ubuntu. If necessary, shrink an existing partition or delete an empty partition using the Disk Management tool in Windows.

Seeking Additional Help

If you are still facing issues, consider seeking help from the Ubuntu community forums or ask for assistance from experienced users who have encountered similar problems.

Remember, the more specific details and error messages you provide, the easier it will be for others to help you troubleshoot the issue.

In conclusion, while the “Failing to unmount /cdrom” error can be frustrating, it’s not an insurmountable problem. With a bit of patience and the right troubleshooting steps, you can successfully set up a dual boot system with Ubuntu and Windows 10.

How do I create a bootable USB stick for Ubuntu installation?

You can use tools like Rufus to create a bootable USB stick. Simply download Rufus, insert your USB stick, select the Ubuntu ISO file, and click "Start" to create the bootable USB.

Can I install Ubuntu on a FAT32 partition?

No, Ubuntu cannot be installed on a FAT32 partition. You need to ensure that you have a separate partition formatted as NTFS or ext4 for the Ubuntu installation. Use the Disk Management tool in Windows to check and modify your partition format.

How do I disable fast startup and hibernation in Windows?

To disable fast startup and hibernation features in Windows, go to the Power Options in Windows, choose "Choose what the power button does", and then "Change settings that are currently unavailable". Under "Shutdown settings", uncheck the boxes for "Turn on fast startup" and "Hibernate".

How do I access the BIOS settings on my computer?

To access the BIOS settings, restart your computer and press the appropriate key (usually F2, F12, DEL, or ESC) when prompted. Once in the BIOS, navigate to the Boot tab and set the boot order accordingly.

Should I disable secure boot in the BIOS settings before installing Ubuntu?

Some systems may require you to disable secure boot in the BIOS settings before installing Ubuntu. Secure boot is a security standard that can cause issues with dual boot setups. Check your PC manufacturer’s documentation or support website for instructions on disabling secure boot.

How do I update my UEFI firmware?

To update your UEFI firmware, visit your PC manufacturer’s website and look for the latest firmware updates for your specific model. Follow the instructions provided by the manufacturer to update your firmware.

How do I verify disk and partition information on Ubuntu?

Boot from the LiveUSB and open a terminal. Run the command sudo lshw -short -C disk ; lsblk | grep -v loop ; df -h | grep -v loop ; sudo blkid ; dmesg | grep '/dev/sd' ; dmesg | grep '/dev/nvm'. This command will provide a detailed list of your disks and partitions. If you need help interpreting the output, consider seeking help from the Ubuntu community forums.

How do I disable the CDROM source in Ubuntu?

You can disable the CDROM source by opening a terminal and typing sudo nano /etc/apt/sources.list. Find the line that refers to the CDROM and put a # at the beginning of the line to comment it out. Save and exit (CTRL+X, then Y, then ENTER). Also, disable any CDROM checkboxes in the "Software & Update" settings.

How do I ensure I have enough disk space for Ubuntu installation?

Use the Disk Management tool in Windows to check the available disk space on the partition where you want to install Ubuntu. If necessary, shrink an existing partition or delete an empty partition to free up space.

Where can I seek additional help for Ubuntu installation issues?

If you are still facing issues, consider seeking help from the Ubuntu community forums or ask for assistance from experienced users who have encountered similar problems. Remember to provide specific details and error messages to help others troubleshoot the issue effectively.

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