How do I achieve dual boot after a custom Ubuntu install on a Windows 11 machine?

cn flag

I am trying to add Ubuntu to a new Windows machine. It has a 1 TB SSD with Windows 11 on it. I have shrunk the Windows partition and freed up 500 GB of space for Linux. When I install Ubuntu there's two options "install alongside Windows" or "Something else". Since I want to use another file system (btrfs) I assume I need to choose "Something else" which is what I did. After having assigned the free space for a btrfs / partition and point to the existing EFI partition I did the install. It completed without problems. But when rebooting I was back in Windows with no Linux boot option at all. The Linux partition was shown as "unknown" in Windows.

How can I get dual boot Windows/Ubuntu in this case where I create free space for a btrfs partition to run Ubuntu on?

Pilot6 avatar
cn flag
You did all correctly. Check UEFI boot priority.
cc flag
Check the Windows power option for "fast start" is off, so shutdown is not hibernate. Does the EFI menu (some key at powerup to choose boot device/os) give you an ubuntu choice? When selected, does grub boot?
karel avatar
sa flag
Does this answer your question? [Can't boot into Ubuntu in Windows 10 / Ubuntu dual boot](

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.