how to repair ubuntu installation

• Insert your Ubuntu CD, reboot your computer and set it to boot from CD in the BIOS and boot into a live session. ...
• Install and run Boot-Repair
• Click "Recommended Repair".
• Now reboot your system. The usual GRUB boot menu should appear. If it does not, hold Left Shift while booting. You will be able to choose between Ubuntu and Windows.

Full Answer

How to fix broken Ubuntu without reinstalling it?

Fix Broken Ubuntu OS Without Reinstalling It. First of all, try to login with live cd and backup your data in an external drive. Just in case, if this method didn't work, you can still have your data and reinstall everything! At the login screen, press CTRL+ALT+F1 to switch to tty1.

How do I use boot repair on Ubuntu?

By booting up your PC into Ubuntu / Debian via a live-CD or live-USB, then installing Boot-Repair in the live system, just launch Boot-Repair, then click the “Recommended repair” button will automatically detect the problems and recover access to your OSes. How do I download boot repair?

How do I repair Ubuntu from a live CD?

There’s a utility that you can run from an Ubuntu live CD/USB that automatically repairs your system. You don’t have to worry about the specifics or even diagnose the problem.

How do I install Ubuntu on a non-booting computer?

If you go with dd, find the location of your drive, and your command should look something like this: When you have your live medium, insert it in your non-booting computer and start it up. Select the medium through your motherboard’s boot options. When Ubuntu comes up, select the “Try Ubuntu” option.

Can you repair Ubuntu?

Boot-Repair is a simple tool to repair frequent boot issues you may encounter in Ubuntu like when you can't boot Ubuntu after installing Windows or another Linux distribution, or when you can't boot Windows after installing Ubuntu, or when GRUB is not displayed anymore, some upgrade breaks GRUB, etc.

Can you repair Ubuntu from USB?

Repair GRUB If You Can't Access It You can use an Ubuntu installation disc or USB drive to do this. Boot into the USB drive and use the the Linux system to repair GRUB. We have a guide to reinstalling the GRUB2 boot loader on Ubuntu, either with a graphical Boot Repair tool or by using standard Linux terminal commands.

How do I fix Ubuntu Not Working?

If Ubuntu is not booting, work through these five steps:Check for bootable devices.Is the GRUB bootloader working?Repair the bootloader menu.Reinstall Ubuntu.Replace faulty hardware.

How do I wipe and reinstall Ubuntu?

1 AnswerUse Ubuntu live disk to boot up.Select Install Ubuntu on hard disk.Keep on following the wizard.Select the Erase Ubuntu and reinstall option.

How do I run boot repair?

Method 1: Startup Repair toolStart the system to the installation media for the installed version of Windows. ... On the Install Windows screen, select Next > Repair your computer.On the Choose an option screen, select Troubleshoot.On the Advanced options screen, select Startup Repair.More items...•

How do I restore Ubuntu 20.04 to factory settings?

To start with automatic reset, follow the below steps:Click on Automatic Reset option in the Resetter window. ... Then it will list all the packages that it will be going to remove. ... It will start the reset process and creates a default user and will provide you with credentials. ... When finished, reboot your system.

What is Ubuntu recovery mode?

The Ubuntu operating system comes with a “recovery mode.” With this feature, users can access the command-line of a broken system, fix a misconfigured file, test if system memory isn't working, and a lot more.

How do I restore Ubuntu to factory settings?

The only foolproof way to factory reset Ubuntu is to do a fresh install. Just backup your home folder and other required files, make a bootable USB and you are ready to go. Reinstalling Ubuntu probably will be much faster than say Windows 10 doing a factory reset, which can drag on for hours.

How do you fix a broken grub?

Another way to fix your GRUB boot issues is to use a Linux live image to boot from an external device.Download a live Linux installer. ... Use a tool such as Etcher to write the Linux image to an SD card or a USB flash drive.Insert the bootable device and start the computer.Select Try Ubuntu on the welcome screen.More items...•

How do I reformat Ubuntu?

How to Format a Hard Drive in UbuntuCollect information about your new hard drive. ... Click "System", select "Administration" and choose "Partition Editor," which is sometimes labeled "GNOME Partition Editor". ... Check the settings for the disk. ... Choose the drive format based on your expected use. ... Click "Apply."

Should I erase disk and install Ubuntu?

If you want to remove Windows and replace it with Ubuntu, choose Erase disk and install Ubuntu. All of the files on the disk will be deleted before Ubuntu is put on it, so make sure you have backup copies of anything you wanted to keep.

How do I reset Ubuntu without reinstalling?

There is no such thing as factory reset in ubuntu. You have to run a live disk/usb drive of any linux distro and backup your data and then reinstall ubuntu.

How can I fix Ubuntu OS without reinstalling it?

How to Fix Broken Ubuntu 20.04 without Reinstalling ItStep 1: Login from Live CD or bootable USB. ... Step 2: Remove the lock files. ... Step 3: Reconfigure dpkg. ... Step 4: Clean local repository. ... Step 5: update all the packages. ... Step 6: install all broken packages and dependencies. ... Step 7: Reboot the system.

How do I install Ubuntu from a flash drive?

Boot from USB flash drive Insert the USB flash drive into the laptop or PC you want to use to install Ubuntu and boot or restart the device. It should recognise the installation media automatically. If not, try holding F12 during startup and selecting the USB device from the system-specific boot menu.

Where is Boot Repair in Ubuntu?

Boot Repair is not available in the official package repository of Ubuntu. So you have to install it from the Boot Repair PPA. Now press to continue. The Boot Repair PPA should be added and the APT package repository cache should be updated.

How do you fix a broken grub?

Another way to fix your GRUB boot issues is to use a Linux live image to boot from an external device.Download a live Linux installer. ... Use a tool such as Etcher to write the Linux image to an SD card or a USB flash drive.Insert the bootable device and start the computer.Select Try Ubuntu on the welcome screen.More items...•

Fixing process

If you came across the error something like, ‘Could not get lock /var/lib/apt/lists/lock’ or ‘Could not get lock /var/lib/dpkg/lock’, then you can fix this broken issue by following the step by step guide provided below:

Step 1: Login from Live CD or bootable USB

First of all, sign in using the live CD or bootable USB drive, and back up your data in some external hard drive so that you can save it somewhere else and reinstall the operating system if needed.

Step 2: Remove the lock files

Open tty1 using the keyboard shortcut keys CTRL + ALT + F1, and type the commands provided below to remove the lock files.

Step 3: Reconfigure dpkg

To reconfigure all the packages installed, type the command provided below;

Step 5: update all the packages

After clearing the local repository, update the installed packages with the –fix-missing option.

Step 6: install all broken packages and dependencies

Now, force the package manager to install all the broken packages or missing dependencies using the command provided below:

Step 7: Reboot the system

After fixing everything up, restart eh system using the command provided below:

How to get to recovery mode in Ubuntu?

When you start up your Ubuntu PC, hold down the Shift key. The GRUB menu will pop open. Select the “Advanced Options” entry. It’ll probably be the second one from the top. From there, you’ll see several different kernel options. Under each one will be an identical entry with (recovery mode) at the end. Select the recovery entry for the latest kernel.

How to get to Advanced Options in Ubuntu?

Select the "Advanced Options" entry. It'll probably be the second one from the top. From there, you'll see several different kernel options. Under each one will be an identical entry with (recovery mode) at the end. Select the recovery entry for the latest kernel.

How to use live medium in Ubuntu?

When you have your live medium, insert it in your non-booting computer and start it up. Select the medium through your motherboard’s boot options. When Ubuntu comes up, select the “Try Ubuntu” option.

Can you shut down Ubuntu and remove the live medium?

You can now shut down Ubuntu and remove the live medium when you’re prompted to do so. Boot back up into your normal Ubuntu system to see if everything worked.

Can Ubuntu live CD repair my system?

There's a utility that you can run from an Ubuntu live CD/USB that automatically repairs your system. You don't have to worry about the specifics or even diagnose the problem. It automatically runs through with the click of a button. So, that's probably a good first option.

Can you boot normally after thining?

After you thin you have your system sorted out, you can try to boot normally with resume.

Can you run a utility in the same terminal window?

Finally, you can run the utility. You can use the same terminal window that you’re working in to launch it directly.

What is a boot repair?

Boot-Repair is a simple tool to repair frequent boot issues you may encounter in Ubuntu like when you can't boot Ubuntu after installing Windows or another Linux distribution, or when you can't boot Windows after installing Ubuntu, or when GRUB is not displayed anymore, some upgrade breaks GRUB, etc.

What is pastebin in Ubuntu?

Ubuntu's Pastebin is not easily indexable or searchable , and purpose of the tool which creates this page (Boot-Info) is meant to be a very benign and helpful solution to the problem. The intention is not violate your privacy, nor is it meant to make you a target. This tool is aimed entirely at those new to Ubuntu who want to get past their booting issues and enjoy using Linux. If you'd like to, you may completely opt out of all internet usage including pastebin link generation by looking at the Advanced Options section below. Please do not use this software if this is a problem for you.