- Boot into windows, resize (shrink) windows partition with disk management tool to create space for Apricity.
- Download Apricity and write to USB stick.
- Go into BIOS (Esc+F10 at boot). Disable trusted boot.
- Boot off USB Stick (F9 at boot). If you cannot choose “Install” from subsequent boot menu, specifically choose the EFI file.
- Select custom partitioning, create your / and swap partitions in the free space previously created. Remember to mount your first FAT32 partition as /boot/efi or the bootloader won’t install.
- When finished reboot into Apricity. Do a full update, ensure you are on kernel 4.5+.
- In /etc/default/grub set GRUB_DEFAULT=saved & uncomment GRUB_SAVEDEFAULT=”true” to remember previous OS.
- Add Windows to boot menu with
su -c ‘os-prober && grub-mkconfig -o /boot/grub/grub.cfg’
Note: if you apply a large windows update (service pack size), you may find that the GRUB boot loader is broken and goes into Rescue Mode. You can fix this by temporarily changing the root partition that GRUB needs to find and then fixing it permanently by running sudo grub-install.