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One of the common problems you may encounter is Linux not booting after installation. Although Linux is a reliable operating system, sometimes you will face such problems, but don’t worry; You can easily fix these problems. The methods we will mention below have been tested and are completely practical to solve the problem of not booting the Linux Ubuntu server and desktop.

Solutions to solve the problem of not booting Linux

If you encounter the problem of Linux not booting after installation, you can solve the problem completely by doing one of these five things:
1. Checking Bootable Devices
2. Checking the GRUB bootloader
3. Reconstruction of the bootloader menu
4. Reinstall the operating system
5. Replacement of damaged hardware
These solutions have been tested on Ubuntu Linux, but you can also use them on other Linux versions. Of course, it should be noted that some of these solutions may not work if Disk encryption is used.

1- Checking bootable devices

One of the most common reasons for Linux not booting after installation is that a bootable disk is attached to the system. This problem usually occurs immediately after installation because the Ubuntu bootable disk (USB flash or DVD) is still connected to the system. Due to such a problem, you will encounter a message during the installation asking you to remove the installation disk from the computer before the system’s first boot.
Enter the BIOS or the Boot Order menu to check the default boot drive. When the computer starts up, you can access the BIOS menu by pressing the F8, F12, or Esc keys. In this menu, find Boot Order and place it on the Linux drive.

2- Checking the GRUB bootloader

GRUB is a boot loader whose job is to ensure that your chosen operating system boots. In systems that have two separate operating systems, this bootloader displays all operating systems and boots the operating system of your choice. Of course, if you have installed Windows in addition to Ubuntu, the bootloader will be overwritten and will not boot Linux after installation.
Other problems such as failed upgrade or a power failure may also cause the bootloader to crash.

Restart your computer while holding down the shift key to ensure GRUB is healthy. After the system boots up, you should see a list of installed operating systems. Items in the list can be selected using the cursor keys.
The GRUB bootloader is corrupted or overwritten if you don’t see this list. In such cases, rebuilding the bootloader is the only solution (if you have installed two operating systems, you can still access Windows).

Rebuilding the GRUB bootloader for Ubuntu Linux boot

If GRUB doesn’t load, Ubuntu won’t boot either, but luckily you can rebuild this bootloader using the Ubuntu installation disk. While the installation disk is connected to the computer, restart it and wait for the disk to load.
You may need to change the Boot Order to load it instead of the OS installation disk. Before changing the Boot Order, write down its order.
Boot-repair will be installed and run by entering this code. Wait for the system to scan and then select Recommended Repair. Advanced Options is also an option, through which you can choose the default operating system, disk or partition, etc.
After finishing work, select the Apply option. Now you can restart your computer and enter Ubuntu Linux. In the GRUB bootloader menu, Ubuntu will be listed as one of the options.

3- Reconstruction of the bootloader menu

If GRUB loads but you can’t run Ubuntu Linux and can only see the bootloader, you don’t need to do the previous steps. There is a built-in recovery tool that you can use to fix problems if Ubuntu Linux doesn’t boot.

To do this in the bootloader menu:

• Select Advanced Options for Ubuntu.
• Using the cursor arrows, select the option that has the word Recovery Mode.
• Select the Enter key to continue.

Wait for a light version of Ubuntu to load. If you have ever used Windows in Safe Mode, you will know that this version of Linux is similar. At this point, there are many options that you can use to fix the problem of Linux not loading after installation, but it is better to use the following options:

• Fsck: This tool is used to check system files. By choosing this option, the hard disk will be checked, and all the errors will be fixed.
• Clean: Use this option to free up space. This option is recommended if the reason for not loading Linux is a lack of free space.
• Dpkg: By choosing this option, you can restore damaged software packages. If the software is not updated or installed correctly, it may cause Linux not to boot. In such a situation, their reconstruction can solve the problem.

If you have just installed Linux and it does not boot, it is better to check the failsafe tool. In such a situation, the problem may be with the graphics drivers or the Xorg graphics server, which can be solved with the failsafe tool.

4- Reinstall the operating system

If fixing Linux won’t boot after installation is too time-consuming, you may prefer reinstalling the operating system from scratch. You can do this without deleting the existing folders and files, and it’s one of the easiest solutions to fix this problem.

1- First, enter the Ubuntu Linux installation menu using the abovementioned method.
2- Then start installing Ubuntu Linux.
3- When the installer detects that Ubuntu is installed, select the Reinstall Ubuntu option.
4- Select the option that has the notes Documents, music, and other personal files will be kept…
5- Continue reinstalling the operating system until the end.

For more caution, it is better to have a backup of all your essential files. You can make a backup manually or use specialized software for this task.
After the installation of the operating system is completed, it will run easily.

5- Check the system hardware

Another problem that may prevent Ubuntu from running is the damaged system hardware. Boot issues may be related to the following hardware:

• Hard disk and its cables
• motherboard
• CPU
• power

If it is a hardware problem, the part in question must be repaired or replaced. In case of replacing parts such as a hard drive, you must install Ubuntu from the beginning.