Unlock bootloader on Google Pixel (Sailfish)

Enable developer options By going to

Settings > System > About Phone > Developer options (Tap 7 times)

Enable OEM unlock in Developer settings

Reboot into recovery

If your one Verizon you may need to go through a couple extra steps to get the oem unlock to show up in the developer settings. More info here

Boot into twrp

fastboot img twrp.iso

Select the option in TWRP to sideload and sideload the Lineage iso

adb sideload lineage

Reboot install GAPPS

adb sideload gapps.zip

How to replace Grub with default Windows Bootloader

Note that running this procedure could render any Linux partitions inaccessible.

Boot up into recovery, launch the Command Prompt and run the following command

BootRe.exe /fixmbr

The command should remove Grub and replace it with the Windows bootloader, so when you reboot it should go straight to Windows.