Super detailed tutorial on dual system installation of Win10+Ubuntu18.04
The main content of this tutorial includes: preparation, making U disk, disk partitioning and installation process
Article directory
1. Preparation work
这部分接受首先需要搞清楚你的电脑BIOS模式，然后再下载好所需软件
1.1 Confirm BIOS mode
Press Win + R keys to open Run and enter msinfo32
The BIOS mode is divided into traditional mode and UEFI mode. If you install it in the traditional BIOS (Legacy) mode, the screen may always be black or stuck in the future. Nowadays, most computers are in UEFI mode. This tutorial only introduces the dual-system installation method in the new UEFI mode.
后面BIOS的也会具体设置
1.2 Confirm the number of hard drives
Right-click the computer, select Manage, and then click Disk Management in the left column. The number of disk numbers indicates how many hard drives there are.
单块硬盘和双块硬盘安装其实差不多，主要区别是在磁盘分区时的细微差异，具体看第三部分磁盘分区。
1.3 Software download
Ubuntu image download
If the download speed is slow, you can choose domestic mirror source download - Tsinghua source download list
UltraISO tool download
You can try it for free after installation
2. Make U disk
Here you need to prepare a 4G or above U disk. Remember to back up the data in it. You will format it later, and then you can write the downloaded Ubuntu image into the U disk.
1. Open the software
2. Select the Ubuntu image to be written
3. Format the USB flash drive
The default file system is fine. The larger the allocation unit size is, the higher the efficiency will be, but the waste will be greater. On the contrary, if the efficiency is not improved, the waste will not be large. Just choose 16 KB.
4. Start writing
After the writing is completed, the U disk boot is ready.
3. Disk partition
3.1 Single block situation
If it is a single block, four partitions need to be compressed first.
（压缩卷即选中磁盘的最后一个盘，比如一个硬盘分成了C和D盘，则选择D盘，如果分成了C、D、E盘，则选择E盘）
Right-click, select Compressed Volume, and enter the size of the volume.
Why choose the last disk to compress the volume: The file storage formats of Windows and Ubuntu are different. Our partition operation only divides a part of the disk to Ubuntu. In fact, the two systems still share a disk. In order to prevent the storage formats from being different The two systems may affect each other. We compressed the Ubuntu partition from the last disk to the last segment of the disk. That is, the front part of a disk is the Windows partition, and the back part is the Ubuntu partition.
The specific partitions and sizes are as shown below:
3.2 Double block situation
双块可以先在C盘（系统盘）中压缩一个200M及以上的分区用来存放引导文件即启动项/boot, and the areas of the other three mount points can all be placed on the second disk. You can divide the compressed volume into three areas now, or you can divide it during Ubuntu installation.
Anyway, during installation, you have to enter the manual partition interface to select the boot area. We will divide it specifically during the installation process.
单双硬盘为什么分区存在区别：You can see that the only difference in partitioning is that when using dual hard drives, 200M is allocated on the C drive to install startup items. When the computer is turned on, it will automatically search for startup items on the hard disk where the C drive is located to start the system. Of course, we hope that the installed ubuntu startup items can also be searched, so we need to install the startup items here so that they will be searched when booting. Go to the two startup items of windows and ubuntu, we can manually choose which system to enter. Of course, the "startup items need to be installed on the hard drive where the C drive is located" is not absolute. It is just to automatically search for the startup items when booting. It can also be installed on other hard drives. It is just that you need to enter the boot manager every time you boot to find ubuntu to start. item, this would be more troublesome.
4. Start the installation
4.1 BIOS settings
Usually there will be a key prompt to enter the BIOS interface on the computer startup interface. Different computer models have different keys.
If the above is not correct, you can search for the BIOS entry button of your computer model.
① Secure Boot Mode
Set Secure Boot Mode to Disabled
② Boot Mode
Set Boot Mode to UEFI
③ USB Boot
Set USB Boot to Enabled
④ Move the U disk up in Boot Devices Order and set the U disk as the preferred boot option.
4.2 Specific installation
Open the desktop Install Ubuntu 18.04 LTS
1. Select language
2. Don’t connect to the network first.
There is no need to connect to the network here. Everything in the normal installation is in the image file.
3. Normal installation
4. Manual partitioning
这里需要手动的添加分区
① Startup boot file/boot
size: 200M and above
Used for: Ext4 log file system
Mount point: /boot
如果是单块硬盘，在唯一的一个空闲分区上添加；如果是双硬盘，找到事先分好的空闲分区添加（C盘）
is used to store Ubuntu startup boot files
② Swap space swap
size: 2 times the memory space.
Used for: Swap space
serves as the virtual memory of Ubuntu. The general size is about 2 times the physical memory of the computer.
③ Root directory/
size: 20G and above.
Used for: Ext4 log file system.
Mount point: /
The root directory of ubuntu is used to install the system and software. It is equivalent to the C drive of Windows, so it can be adjusted according to the size of the hard disk.
④ Home directory /home
size: All the rest is allocated to it.
Used for: Ext4 log file system.
Mount point: /home
is equivalent to other disks in Windows. All the rest is allocated to it.
最后注意，安装启动引导器的设备要选择正确, and then you can click Install Now.
5. Set username and password
6. Complete the restart.
After the restart, 刚开始就拔掉U盘，否则会重新进入安装界面the dual-system Ubuntu installation is finally completed.
Summarize
There is a lot of content, thank you for watching carefully~~~