Instructions

The instructions are given in a loose chronological order where it is possible to switch around the order in many cases.

Links

dual-booting-ubuntu-and-windows-10 Explanation of Bitlocker and TBM

Create bootable Ubuntu USB drive

• I used Rufus
• USB drive capacity > 1.6 gb
• Select partition scheme to be the same as the partition that Ubuntu will be installed to
• The partition scheme must also be set to UEFI. Since windows is likely installed with this setting and it must be uniform accros all installation.
• Use FAT32 file system
• Select the Ubuntu disk image
• When asked select iso mod. In case problems araise later use DD mode instead.

Prepare PC

• Turn off BitLocker, decryption takes approximately 20 min.
• Use Windows Disk Management to create free space by scrinking the main Windows partition(>100BG)
• Disable secure boot

$ WinKey+R
$ shutdown.exe /r /o /f /t 00

• Select Troubleshoot->UEFI Firmware Settings
• In BIOS, disable Security->Secure Boot and set Startup->UEFI/Legacy Boot to UEFI only
• (optional) set Boot Mode to Diagnostics

Installing Ubuntu

• Press F12 during boot
• Boot from the USB drive
• Create a ext4 partition from the free disk space
  • Use root(/) as mounting point
• Select partition with windows bootloader(efi) to install linux bootloader, usually 2nd partition

Booting Ubuntu

• Press F1 during boot to enter BIOS
• Change boot order under Startup->Boot so that ubuntu is at the top

Post setup

• Costomize the grub boot order GUI or commandline
• Enable Bitlocker and backup the new recovery key
• Revert various changes in BIOS
  • Enable "Secure Boot"