1、引言
众所周知，Windows在UEFI+GPT下无法用传统方式设置启动项来引导双系统，以Linux发行版系统为例，一个解决方法是每次启动从ubuntu引导，然而对于不常用ubuntu系统的人来说，每次开机从ubuntu引导无疑是非常麻烦的，所以这里我们使用一个第三方工具rEFInd来引导。
这里我以Deepin为例，win10装在固态上，Deepin在机械上，值得一提的是，如果你想将双系统装在不同的硬盘上，Deepin所在的硬盘分区表也必须为gpt格式，可以使用DiskGenius无损转换，而ubuntu则允许为mbr格式。
安装所需工具见文末百度云链接，需要的自取。
2、rEFind的安装
下载地址：https://sourceforge.net/projects/refind/
打开DiskGenius，找到ESP分区即我们的EFI引导分区，右键选择“指派新的驱动器号”，(如Z:)，为下一步做准备。
进入ESP分区下的EFI目录，新建文件夹命名为rEFInd，然后我们需要将刚刚下载的rEFind文件搬进来。
解压refind-bin-0.11.2.zip，进入refind目录，仿照refind.conf-sample，新建文件refind.conf，不会写也没关系，先建个空文件，否则会报错，我们后面再讲如何配置。
将refind目录下所有文件包括文件夹及文件夹内的文件，全放入EFI/rEFInd目录下，注意由于软件功能限制，文件夹只能手动创建，然后右键-“复制文件到当前分区”（一次可以复制多个文件）。
3、修改启动项
使用BOOTICE
选择UEFI
点击修改启动序列
点击添加
进入EFI/rEFind路径，选择refind_x64.efi
修改菜单标题，上移至第一位，点击“保存当前启动项设置”即可
重启即可看到rEFInd引导页了
4、配置rEFind
当你配置好rEFInd，可能会发现有多余的启动项，或是觉得界面不够好看，可以通过修改refind.conf来编辑菜单项或是更换主题。
rEFInd Theming:
http://www.rodsbooks.com/refind/themes.html
推荐一个我使用的主题，个人觉得蛮简洁的
https://github.com/EvanPurkhiser/rEFInd-minimal
更改主题只需要将解压后的文件放在refind/themes下即可
效果图：
refind.conf的配置这里不做具体分析，可以参考以下三篇博客：
https://blog.csdn.net/bleachswh/article/details/51713567
https://blog.csdn.net/XiaoshaXs/article/details/52016717
https://blog.csdn.net/han_shan_zi/article/details/79207002
下面我贴出我自己的配置文件，deepin自己p了一个图标可以在百度云链接里icons下找到，ubuntu用默认的就好。
注意：
1.更改主题需要在refind.conf最后一行加上include themes/rEFInd-minimal/theme.conf，具体路径根据你的目录而定
2.更改后的文件需要从DiskGenius重新替换，主题文件也一样
refind.conf
#
# refind.conf
# Configuration file for the rEFInd boot menu
#
timeout 5
hideui badges
scan_all_linux_kernels false
dont_scan_dirs EFI/ubuntu, EFI/Boot
include themes/rEFInd-minimal/theme.conf
theme.conf
# Minimal refind theme
# Hide user interface elements for personal preference or to increase
# security:
# banner - the rEFInd title banner (built-in or loaded via "banner")
# label - boot option text label in the menu
# singleuser - remove the submenu options to boot Mac OS X in single-user
# or verbose modes; affects ONLY MacOS X
# safemode - remove the submenu option to boot Mac OS X in "safe mode"
# hwtest - the submenu option to run Apple's hardware test
# arrows - scroll arrows on the OS selection tag line
# hints - brief command summary in the menu
# editor - the options editor (+, F2, or Insert on boot options menu)
# badges - device-type badges for boot options
# all - all of the above
# Default is none of these (all elements active)
#
#hideui singleuser,hints,arrows,label,badges
hideui label,singleuser,safemode,hwtest,arrows,hints,editor,badges
# Set the name of a subdirectory in which icons are stored. Icons must
# have the same names they have in the standard directory. The directory
# name is specified relative to the main rEFInd binary's directory. If
# an icon can't be found in the specified directory, an attempt is made
# to load it from the default directory; thus, you can replace just some
# icons in your own directory and rely on the default for others.
# Default is "icons".
#
icons_dir themes/rEFInd-minimal/icons
# Use a custom title banner instead of the rEFInd icon and name. The file
# path is relative to the directory where refind.efi is located. The color
# in the top left corner of the image is used as the background color
# for the menu screens. Currently uncompressed BMP images with color
# depths of 24, 8, 4 or 1 bits are supported, as well as PNG images.
#
banner themes/rEFInd-minimal/background.png
# Tells rEFInd whether to display banner images pixel-for-pixel (noscale)
# or to scale banner images to fill the screen (fillscreen). The former is
# the default.
#
banner_scale fillscreen
# Custom images for the selection background. There is a big one (144 x 144)
# for the OS icons, and a small one (64 x 64) for the function icons in the
# second row. If only a small image is given, that one is also used for
# the big icons by stretching it in the middle. If only a big one is given,
# the built-in default will be used for the small icons.
#
# Like the banner option above, these options take a filename of an
# uncompressed BMP image file with a color depth of 24, 8, 4, or 1 bits,
# or a PNG image. The PNG format is required if you need transparency
# support (to let you "see through" to a full-screen banner).
#
selection_big themes/rEFInd-minimal/selection_big.png
selection_small themes/rEFInd-minimal/selection_small.png
# Which non-bootloader tools to show on the tools line, and in what
# order to display them:
# shell - the EFI shell (requires external program; see rEFInd
# documentation for details)
# gptsync - the (dangerous) gptsync.efi utility (requires external
# program; see rEFInd documentation for details)
# apple_recovery - boots the Apple Recovery HD partition, if present
# mok_tool - makes available the Machine Owner Key (MOK) maintenance
# tool, MokManager.efi, used on Secure Boot systems
# about - an "about this program" option
# exit - a tag to exit from rEFInd
# shutdown - shuts down the computer (a bug causes this to reboot
# EFI systems)
# reboot - a tag to reboot the computer
# firmware - a tag to reboot the computer into the firmware's
# user interface (ignored on older computers)
# Default is shell,apple_recovery,mok_tool,about,shutdown,reboot,firmware
#
#showtools shutdown
showtools reboot,shutdown,firmware
5、所需工具
https://pan.baidu.com/s/1AHIqbY08tAqI51eVlwF7Cw
说明一下，DiskGenius和BOOTICE都是免安装的，refind-bin-0.11.2.zip即为rEFInd文件，rEFInd-minimal-master.zip是主题文件，可在GitHub自行下载，icons是deepin的图标，其他几个为deepin和ubuntu的系统镜像和系统制作工具，不需要的无视就好。
欢迎提问和指正。