deepin linux boot errors after installing grub>

After installation deepin mispriming

,,, a busy night finally solved too hard to understand the working principle of grub but not loss ,,,, the whole process is full of despair (cry

Specifically how how it follows

1. Deepin installation guide can not get stuck in grub after you install 15.11> Interface
2. Preliminary guess is that the system did not find, so look for ways to fix the boot into the following two major attempt

   • https://wiki.deepin.org/wiki/%E4%BF%AE%E5%A4%8D%E5%90%AF%E5%8A%A8

   • https://www.cnblogs.com/schips/p/10141278.html

3. Above two methods tried six hours are a step in the emergence of various problems during error ... failed (Landlords night did not get the luck)
4. Manual guidance system? Tutorials probably say

   • In the grub> prompt

   • set root=(hd1,4)
   • linux / boot / vml (tab completed)
   • initrd /boot/init (tab 补全)
   • boot
5. Enter the screen after a black heart in a happy, then saw can not find / root ... then another card to the next command line I stuck here for half an hour but will get stuck quit exit
6. Then change the thinking: This question should be a lot to see, whether it should start from the surface of the problem, for example, I only saw the show grub> interface
7. Find reasons Baidu appears grub> Many of the results are actually possible but I understand a little bit more or less deviation ....
8. According to this step successfully boot into the system

   • from: https://sspai.com/post/55875

   • In the grub> prompt

   • set root=(hd1,4)
   • set prefix=(hd1,4)/boot/grub
   • insmod normal
   • normal
   • After entering the system needs to execute two commands
   • update-grub
   • grub-install / dev / sdb // It should be noted that the operation will not prompt you with the --force parameter can be a class from: https://www.cnblogs.com/studyone/p/5500679.html
9. After the restart or grub> still need to manually guide ... So the problem is not resolved Well (

Up to eight hours of time, but fortunately the overnight fast is resolved)

other problems

1. deepin live source system to do so comes to be switched and restarted after the handover command is preferably

2. Above (hd1,4) refers to a second hard disk (HD1), the fourth partition, may also be expressed as (hd1, gpt4) indicates GPT partitions can view all partitions particular grub> ls input

   (fd0) first floppy disk
   (hd0) First hard disk [most of the U disk and removable hard disk and SD card USB interface have also been viewed as a hard disk]
   (hd1, 1) the first partition of the second hard disk (MBR in common and GPT partition)
   (hd0, msdos2) a first hard second MBR partition, i.e. conventional DOS partition table
   (hd1, msdos5) a fifth MBR partition the second hard disk, i.e. a first logical partition
   (hd0, gpt1 ) the first hard disk first GPT partition

(cd) bootable CD [GRUB only available when starting from the CD]
(cd0) a first optical disk

1. The most important thing is to think ,,,, do not think this issue is too complex ... in fact, just grab appear grub> to solve this problem on the line, I used the windows of the train of thought leads to complicate matters

Here is the problem-solving process in the process of recording

You can not use the add-apt-repository command under Ubuntu
https://my.oschina.net/u/1011130/blog/1840013

apt-get install software-properties-common

http://tieba.baidu.com/p/5185706072
apt-get install dirmngr

https://www.cnblogs.com/schips/p/10141278.html

Follow the steps it needs to take the initiative prompts to uninstall grub

Deepin replacement mirror source
https://blog.csdn.net/baidu_41751590/article/details/89064220
/etc/apt/sources.list
http://ftp.sjtu.edu.cn/deepin/
HTTP: //mirrors.aliyun .com / deepin