After installing ubuntu18 dual system on win10, there is no solution record of ubuntu startup item

1. Win10 install ubuntu18 dual system tutorial

To be added

2. Solve the problem of no startup items after installing ubuntu18 dual system on win10

Two months ago, I reinstalled win10 on the ThinkPad L440 that I had been in service for six years, and then I was going to install an ubuntu18, because I installed it once on a new computer before and succeeded once. I thought it would still go smoothly, but after installing it, I found that there was no startup item! ! ! Go directly to Windows. After checking all kinds of methods on the Internet, they all failed, and I put it down in anger. Today, I helped the younger sister install the ubuntu dual system, and encountered this problem again. In the spirit of scientific research that does not reach the goal, I started a meal operation, and finally successfully appeared the familiar Ubuntu Grub startup interface. In order to celebrate this great victory, we must write something to commemorate it.

The following records are reorganized after sorting out all the attempts. Learning is a tossing process.

1. Lazy way (slightly troublesome to boot)
   In an accidental attempt, I booted and F12clicked to enter the startup management item, and found that there were two more Linux (TOSHIBA MQ01ABF050) startup items.
   Curiously, I clicked in and tried the first one, but it was wrong. , Reboot, choose the second one, and the Ubuntu startup interface appears magically. So it is concluded that if there is no ubuntu startup item, you can choose to enter ubuntu through the bias startup item. If you don’t want to toss, you can use this method.
2. Repair ubuntu startup
   The steps to repair ubuntu startup are as follows:
   (1) Insert the ubuntu system disk, select the boot option and select the U disk to boot and enter Try Ubuntu, open the terminal and enter the following command once

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair

After that, boot-repair will start and

choose the first recommended repair to continue, and finally the following interface appears to indicate that the repair is complete.

Then restart, enter the ubuntu system (note that the installed ubuntu is entered through the F12 startup item rather than through the U disk), and enter the following command

sudo update-grub
sudo update-grub2

Restart again, and you can see the familiar startup selection interface.

3. If step 2 is unsuccessful go down
   here to Acer computer, for example, after following the above method is not found or tried all startup items, refer to this article on Windows10 + Ubuntu18.04 dual system after installation can not start Ubuntu solution . Finally succeeded.
   (1) Select Set Supervisor Password in security, set the password, and then you can switch the secure boot mode [Enable/Disable] in Boot. It was Disable during installation, and now switch to Enable.
   (2) Then go back to Security, select Select an UEFI file as Trusted for Execting, and then select HDD0->EFI->Ubuntu->grubx64.efi. When the original author said that the file shimx64.efi is also selected, the actual test is selected. It will go wrong, it is right not to choose. Try this bravely, I have always believed in the principle of uncertainty. In addition, there are two HDD0s when using Junior Sister’s computer, one is wrong and the other is right. . So, repeat it again, and try it bravely!
   (3) F10 save the settings and restart, and then immediately enter the BIOS setup interface. At this time, you will find that the boot option has one more item, as shown in the following figure.
   EFI FIle Boot 0: yes is the startup item just added (this place is called yes because there is an interface to enter the name at the end, I thought it was to select the Yes and No below So I typed Yes, and then I realized that it was for me to name it, dizzy!!)
   (4) At this time, jump to the BOOT page, disable Security boot, and then move the boot method (the extra one) just added to At the top, then save and restart, and you will enter the GUN interface.
   (5) To sum up, this wave of Acer computer operations is a real show!