how to repair ubuntu

^{Recommended repair}

• launch Boot-Repair from either : the Dash (the Ubuntu logo at the top-left of the screen) or by typing 'boot-repair' in a terminal
• Then click the "Recommended repair" button. When repair is finished, note the URL ( paste.ubuntu.com/XXXXX) that appeared on a paper, then reboot and check if you recovered access to your ...
• If the repair did not succeed, indicate the URL to people who help you by email or forum.

How do I get rid of Ubuntu?

• Launch PowerMyMac on your Mac and you will see your Mac’ System status.
• Choose App Uninstaller on the left column and click Scan to allow PowerMyMac to find all your apps on Mac.
• After scanning, select Ubuntu from the list of the scanning results as well as its related files.

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How to remove Ubuntu from your PC?

Second Case - Uninstall Ubuntu by removing multi-boot

• Remove all Ubuntu partitions from your drive
• Erase the GRUB sector boot of the main hard drive then install any conventional initiator of your choice
• Restart the PC with a Live CD (Try this without installing)
• Navigate to System – Administration – Gparted

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How do I reboot Ubuntu?

Use systemd command

1. Use reboot command
2. Use shutdown command
3. Use systemd command

How to repair Ubuntu easily?

The Easy Way

• Create Your Live CD/USB. If you don’t already have one, create a live medium to work off of. ...
• Add The PPA. It might seem counter-intuitive, but you can enable a PPA and install software on a live CD. ...
• Install Boot-Repair. Now, you can install Boot-Repair like you normally would with Apt.
• Run The Utility. Finally, you can run the utility. ...

How do I fix Ubuntu problems?

How to Fix Broken Packages in UbuntuCheck for Updates.Force APT to Correct Missing Dependencies or Broken Packages.Force Reconfigure or Remove Broken Packages with DPKG.Resolve DPKG Lock Issue.

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 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.

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 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 fix Ubuntu when it wont boot?

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 completely reset Ubuntu?

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.

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 wipe clean Ubuntu?

To initiate the recovery partition, hold down the command and R keys as the computer restarts and open Disk Utility. Search for the Erase tab security options and click 7-pass Erase. This will write the data to the disk several times.

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 boot Ubuntu as root?

During boot, press and hold Shift (for BIOS) or ESC (for UEFI). This will bring up the Grub2 boot menu from where we can select "recovery mode" (usually the second boot entry). Choose "Resume normal boot" to proceed booting as usual.

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...•

Where is boot file in Ubuntu?

The Boot partition is mounted on a specific directory /boot. The GRUB bootloader configuration files, modules and other assets are kept in the /boot/grub2 directory. The GRUB configuration file can be found at /boot/grub2/grub. cfg.

How do I get to the boot menu in Ubuntu?

With UEFI press (perhaps several times) the Escape key to get grub menu. Select the line which starts with "Advanced options". Press Return and your machine will begin the boot process. After a few moments, your workstation should display a menu with a number of options.

How do I open grub menu in Ubuntu?

You can get GRUB to show the menu even if the default GRUB_HIDDEN_TIMEOUT=0 setting is in effect:If your computer uses BIOS for booting, then hold down the Shift key while GRUB is loading to get the boot menu.If your computer uses UEFI for booting, press Esc several times while GRUB is loading to get the boot menu.

Can not install boot Repair?

Unable to install boot-repairBoot to LiveCD.Connect to Internet.Open terminal.Give command sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update.Then give command sudo apt-get install -y boot-repair && boot-repair.

Introduction

Today, I was upgrading my Ubuntu LTS system. Unfortunately, the power has gone in the middle of the upgrade process and the system is powered off while upgrading packages.

Fix broken Ubuntu OS without reinstalling it

1. First of all, try to login with live cd and backup your data in an external drive. Just in case, if this tutorial didn't work, you can still have your data and reinstall everything!

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 repair a filesystem?

Repair a filesystem. Open Disks from the Activities overview. Select the disk containing the filesystem in question from the list of storage devices on the left. If there is more than one volume on the disk, select the volume which contains the filesystem. In the toolbar underneath the Volumes section, click the menu button.

What happens when you repair a filesystem?

Possible data loss when repairing. If the filesystem structure is damaged it can affect the files stored in it. In some cases these files can not be brought into a valid form again and will be deleted or moved to a special directory.

How to check if a filesystem is damaged?

Check if a filesystem is damaged. Open Disks from the Activities overview. Select the disk containing the filesystem in question from the list of storage devices on the left. If there is more than one volume on the disk, select the volume which contains the filesystem. In the toolbar underneath the Volumes section, click the menu button.

What happens if a filesystem is not repaired?

If the filesystem could not be repaired, back it up by saving an image of the volume to be able to retrieve important files later.

Why is my filesystem corrupted?

Filesystems can be corrupted due to unexpected power loss, system crashes and unsafe removal of the drive. After such an incident it is recommended to repair or at least check the filesystem to prevent future data loss. Sometimes a repair is required in order to mount or modify a filesystem.

Can you use volume again?

To make use of the volume again it has to be formatted with a new filesystem. All data will be discarded.

What does reinstalling Ubuntu do?

The Reinstall option will wipe away all your system-wide settings and return them to their defaults, but that should fix problems that misconfigured system settings could cause. Advertisement. Select this option and continue through the process to reinstall Ubuntu on your computer.

How to back up Ubuntu files?

From here, open the file manager and access the files stored on your Ubuntu system drive. Connect some sort of external storage — such as a USB flash drive or external hard drive — to the computer and use the graphical file manager to back up your files.

How to use recovery mode in Ubuntu?

Use Recovery Mode If You Can Access GRUB. If you do see the GRUB boot menu, you can use the options in GRUB to help repair your system. Select the “Advanced options for Ubuntu” menu option by pressing your arrow keys and then press Enter. Use the arrow keys to select the “Ubuntu … (recovery mode)” option in the submenu and press Enter.

What is a Grub boot?

GRUB will boot your Ubuntu system in a very minimal recovery mode menu, skipping the majority of the system services and all the graphical applications that load. It will even load your file system in a safe read-only mode.

How to check if you have a Grub2 bootloader?

The first thing to check is whether you can access the GRUB2 boot loader. Boot your computer while holding the Shift key. If you see a menu with a list of operating systems appear, you’ve accessed the GRUB boot loader.

What to do if you can't access Grub?

If you can’t access GRUB, you’ll need to repair 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.

Why won't Ubuntu boot?

If you don’t see a menu with a list of boot options appear, the GRUB boot loader may have been overwritten, preventing Ubuntu from booting. This can happen if you install Windows on a drive after installing Ubuntu or another Linux distribution on it. Windows writes its own boot loader to the boot sector, and you won’t be able to boot Ubuntu until you reinstall GRUB.

Do you have to reboot Ubuntu to fix a non root file system?

Non -root file systems do not require you to reboot your Ubuntu OS to attempt file system repair from the Grub menu’s Advanced Options. It can be an OS file system existing on an external USB drive.

Do you need sudo to run fsck?

To comfortably use fsck utility without running into any issues, you need to be a root or Sudoer user on your Ubuntu system. Sudo privileges are necessary for the correct execution of the fsck command.

Can Linux cause headaches?

However, this headache has a valid prescription if you can pinpoint or identify the filesystem partition that is causing your Linux OS to have performance issues.

What is a Linux package?

Linux packages are compressed archives containing programs and files necessary to run them. The package distribution system is designed to be robust and simplify the application installation process.

What command removes a package even if the removal causes further dependency issues?

Warning: The dpkg --purge --force-all command removes a package even if the removal causes further dependency issues. Use the command with care.

Can a package management system cause an error?

However, sometimes the error occurs even if no other processes are using the package management system.