Ubuntu installation on computers running Windows and BitLocker turned on


BitLocker Drive Encryption is a data protection feature that integrates with the Windows operating system. When activated, it will encrypt the contents of the hard drives in Windows, making the data inaccessible without the correct decryption key. It is designed to minimize the risk of data theft or exposure from lost or stolen computers.

When a user starts their computer and properly authenticates with the correct credentials, BitLocker will decrypt the data and allow seamless usage of the hard drive and the data it contains. Without the correct credentials, the encrypted hard drive data will look like random noise.

BitLocker & Ubuntu installation

If you plan to install Ubuntu side by side with Windows, you need to take into consideration the operational setup on your computer.

  • If you are not using BitLocker, Ubuntu will be able to see the correct hard drive structure, including any partitions and data stored on it. This allows the guided wizard to correctly map the data, and safely make adjustments to accommodate the additional installation of Ubuntu alongside Windows.
  • If you are using BitLocker, the hard drive contents will not be accessible, and they will appear as random noise. This means that the Ubuntu installer cannot correctly map data, and the additional installation cannot be safely performed without data loss…

You can:

  • Cancel the installation of Ubuntu and continue using Windows only.
  • Decide that the data stored in Windows is not important, and that you are willing to overwrite the data contents. The Ubuntu installer can then erase the entire contents of the hard drive and create its own structure (partitions and data). This is a destructive operation, with no option to recover any Windows data.
  • Decide to turn BitLocker off. This will turn the encryption feature, and the hard drive and its data will be visible and accessible from the Ubuntu installer, allowing it to correctly and safely set up a side-by-side configuration.

Turn BitLocker off

If you decide to proceed with the third option, you will need to do the following:

  • Back your data up - any encryption procedure, hard drive structure change or installation of new operating systems on a hard drive that already contains data can potentially lead to a data loss. You need to make sure your personal data is safe. Even simply copying the important files to an external drive can minimize the risk of data loss.
  • Quit the Ubuntu installer and reboot the computer into Windows.
  • In Windows, open Settings > type Manage BitLocker in the search box. Alternatively, open Control Panel > System and Security > BitLocker Drive Encryption.

Windows will now inform you that it is going to decrypt the data.


This process can take a little bit of time:



  • Once this step is complete, reboot the computer, log into Windows, to make sure everything works correctly, and that all your data is intact.
  • Reboot your computer again, and launch the Ubuntu installer. At this point, you will be able to proceed with the hard disk configuration step.

Ok, I turned off Bitlocker, Waiting for it to finish, seems like it may be a while…anyway, so after I install Ubuntu, will I be able to reinstall bitlocker or will I have to use your version and I presume its works on the windows side? ,

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I have a strange behaviour on a Lenovo Yoga-Book. Windows 10 installed, Bitlocker not activated (Windows says, that the drive is waiting to be activated).
Partition in partitionmanager itself is shown to have a bitlocker activated…

I cannot install Ubuntu 20 with an active bitlocker, but how can I disable a bitlocker that is already disabled???

@gunther-hebein I had the same issue. Just activate Bitlocker and deactivate it again.


Reminder: The purpose of this thread is to improve documentation.

Your support questions should be directed to AskUbuntu, UbuntuForums, IRC and other support venues.

  • “How do I…?” is a support question
  • “It didn’t work” is a support question or a bug report

When you have an answer, please suggest specific improvements to the documentation strings and images here so that others don’t need to ask the same questions.

@gunther-hebein Alternatively, go to Settings > Device encryption and click the button “Turn off”.
Ref: https://superuser.com/questions/1299600/is-a-volume-with-bitlocker-waiting-for-activation-encrypted-or-not

People are probably asking support questions on this page because:

  1. Ubiquity itself links to help.ubuntu.com/rst
  2. help.ubuntu.com/rst redirects here, rather than to a user-facing version of the document.

If people shouldn’t be asking questions here, where is the user-facing version? Google hasn’t found it.

Initially there were two static pages, but they proved to not display well on phones, so we got bug #1874068 and replaced them with redirects here for now.

The static pages still exist:

So if someone makes those pages phone friendly, we can drop the redirects anytime.

Yikes! I wasn’t expecting to see my scribbly design sketches used in user-facing help pages.

I wonder why those pages are generated from Google Docs (judging by all the .lst-kix_ styles), rather than from these Discourse posts. Many Canonical sites (including ubuntu.com/server/docs and multipass.run/docs) have responsive help pages exported from Discourse posts. But I guess the software doing those exports won’t run on help.ubuntu.com. I’ve made a request for Canonical’s Web team to investigate how to generate responsive exports on help.ubuntu.com as well.