if you choose dev/sda, it’ll use Grub (Ubuntu’s boot loader) to load all systems on this hard drive.
If you choose dev/sda1 (the ext4 partition your created for Ubuntu), Ubuntu need to be manually added to drive’s boot loader after installation. (for example, you previously have Windows installed on another partition of this drive, you’ll need manually add Ubuntu into mbr)

据我观察在UEFI+GPT模式下貌似两种选法都是可以的,或许第二种选法是某些人分区刚好是MBR的然后他们有时候装了双系统后无法引导可能就是由这个原因造成的。同盘装双系统时可能要特别注意这个东西。反正我也不会同盘双系统,对于我来说能启动就行了,不需要过度探究。

参考链接:
http://ubuntuhandbook.org/index.php/how-to-install-ubuntu/
https://blog.csdn.net/weixin_41053564/article/details/85724884
https://blog.csdn.net/weixin_33989780/article/details/86339230

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