The Ubuntu working system comes with a “recovery mode.” With this function, customers can entry the command-line of a damaged system, repair a misconfigured file, check if system reminiscence isn’t working, and much more. Though “recovery mode” exists, quite a lot of Ubuntu Linux customers are unfamiliar with the way it works, and what they’ll do with it. So, on this information, we’ll stroll you thru how to use recovery mode on Ubuntu.
Word: to entry the recovery mode on Ubuntu Linux, you have to be operating the Grub bootloader. If you happen to’re utilizing an alternate bootloader, there’s an opportunity this function won’t be accessible for you.
Recovery mode on Linux
Recovery mode is an possibility within the Grub boot-loader. So, to entry it, reboot your Linux PC. The method of restarting on Ubuntu is shortly carried out in many alternative methods, together with clicking the “Reboot” possibility on your desktop, urgent the hard-reset button on the PC itself, or utilizing the reboot or systemctl reboot instructions in a terminal window.
sudo reboot
Or, in case your working system disallows the power to entry reboot, run:
sudo systemctl reboot
When your Ubuntu PC restarts, the Grub bootloader will seem on display screen, with a number of choices. On a majority of Linux working techniques, you’ll see fairly a number of entries. These entries embody:
- The most recent launch of the Ubuntu Linux kernel to your OS (default entry)
- Superior booting choices to your Linux OS (typically known as Superior choices for Ubuntu)
- Reminiscence check (memtest86+)
- Reminiscence check (memtest86+, serial console 115200)
Look by means of the choice menu for the “Advanced options” entry. Then, when you’ve positioned it, use the Down Arrow to transfer the choice to it. Then, press Enter to entry the “Advanced options” sub-menu within the Grub bootloader.
Within the “Advanced options” sub-menu, a few choices will seem on the listing. On the prime of it, the final kernel that your working system was utilizing earlier than it was up to date to the one you’re utilizing now might be there (although not each Linux OS does this). Following the fall-back kernel, there’s a “recovery” kernel.
The “recovery” kernel is a traditional Linux kernel, with a minor Grub tweak that permits customers to shortly boot into “Recovery mode” on their system, in order that they might entry the command-line to repair one thing, and get well a damaged system.
To load up the “recovery” kernel by means of Grub, press the Down Arrow and transfer the Grub selector to the highest of it. After that, hit the Enter key to drive the system to load it up.
When you’ve chosen the “recovery” kernel within the Grub menu, you’ll see a window labeled “Recovery Menu.” On this menu, there are a number of instruments and choices that you just’ll have entry to.
For data on how to use every of those recovery choices, observe alongside under.
Recovery Mode – Clear
The “Clean” function in Recovery Mode for Ubuntu will enable you to release area on your system partition shortly.
To use the “Clean” function, load up Recovery Mode. Then, use the Down Arrow to spotlight the “clean” possibility and press Enter.
After urgent the Enter key on “clean,” a terminal window will seem. Comply with the directions on display screen, and Ubuntu will do it’s greatest to make some free area.
Recovery Mode – Dpkg
The “Dpkg” possibility accessible to Ubuntu customers in Recovery Mode permits for the power to repair and uninstall any probably damaged packages which are inflicting issues on your system.
Word: this function requires web connectivity. Choose “Network” within the Recovery Mode listing to get on-line earlier than making an attempt to use it.
To use it look, by means of the Recovery Mode listing for “Dpkg” utilizing the Down Arrow. Then, press Enter to begin it up. Learn the on-screen prompts and permit Ubuntu to purge any problematic packages.
Recovery Mode – Fsck
The Fsck function in Recovery Mode can shortly repair a corrupted exhausting drive by scanning it for soiled bytes and eradicating them. This function may be very helpful, as soiled bytes on drives may cause Ubuntu to fail to load.
To use the “Fsck,” spotlight it within the Recovery Mode menu utilizing Down Arrow, then press Enter to begin it up. After that, sit again and let it take away corrupted information, robotically.
Recovery Mode – Grub
“Grub” within the Recovery Mode window lets Ubuntu scan your system and replace the bootloader robotically, by re-setting the Grub system.
To run a bootloader replace, discover “Grub” within the menu and choose it with the Down Arrow. Press the Enter key to begin the replace.
Recovery Mode – Root
Typically, your Ubuntu Linux system might refuse to boot, due to a misconfiguration, system error, and so forth. If the opposite recovery choices we talked about don’t do it, the “Root” one will.
To realize Root entry by means of Recovery Mode, you gained’t want to bear in mind the password. As a substitute, choose “Root,” with Down Arrow, adopted by Enter, then Enter a second time.
