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In a recent reboot of Ubuntu, which failed, I get the message to run fsck manually. How do I do so. I may have a bad HD sector, and it may be easier to reinstall Ubuntu. I'm a newbie, so bear with me.

Lou Hudson
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  • See this, but use your ext4 partition(s) not sdb2 as in example. http://askubuntu.com/questions/642504/ubuntu-14-04-is-not-booting-normaly-after-a-manual-hard-boot/642789#642789 – oldfred Feb 10 '18 at 19:52

2 Answers2

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To check the file system on your Ubuntu partition...

  • boot to the GRUB menu
  • choose Advanced Options
  • choose Recovery mode
  • choose Root access
  • at the # prompt, type sudo fsck -f /
  • repeat the fsck command if there were errors
  • type reboot

If for some reason you can't do the above...

  • boot to a Ubuntu Live DVD/USB
  • start gparted and determine which /dev/sdaX is your Ubuntu EXT4 partition
  • quit gparted
  • open a terminal window
  • type sudo fsck -f /dev/sdaX # replacing X with the number you found earlier
  • repeat the fsck command if there were errors
  • type reboot
heynnema
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  • Hey. And what if `fsck` is to be performed on `/dev/mapper/ubuntu--vg-root`? Is this answer still applicable? – Zero Jun 09 '19 at 14:20
  • @Duos Good question. The answer is, yes it is. – heynnema Jun 09 '19 at 14:47
  • Then I don't know. I was dropped into an initramfs prompt on boot with the message `dev/mapper/ubuntu--vg-root contains a file system with errors, check forced`. I executed `fsck /dev/mapper/ubuntu--vg-root -y` and I now have an infinite scroll of random numbers all over my screen. What's this mean? – Zero Jun 09 '19 at 14:51
  • Before I executed the previous command, I first tried `fsck /dev/sda1` and the report was that it was `clean`. Rebooting the computer did nothing but return me back to initramfs. Doing the same inside Recovery Mode has no effect as well. – Zero Jun 09 '19 at 14:58
  • @Duos Didn't I help you with a network issue recently? If fsck is giving you a scrolling list of numbers, you may have a big hard disk problem. Please start a new question with all of the information, and include a screenshot/picture of the scrolling list for me to see. What started all of this (answer this in the new question). Flag me there with a comment starting with "@heynnema" so I'll get notified. – heynnema Jun 09 '19 at 15:00
  • Here it is: https://askubuntu.com/questions/1149828/infinite-scrolling-random-numbers-on-screen-after-running-fsck-manually – Zero Jun 09 '19 at 16:13
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I'm a little late, but if anyone else reaches this thread, here's what worked for me: The error screen said something about an orphaned linked list at dev/mmcblk0p2 and that I had to run fsck manually. The simple solution is to do exactly what it says: run fsck on the corrupted filesystem.

fsck /dev/mmcblk0p2

This will prompt you through the fixing of the filesystem easily and smoothly.

Pilot6
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christian_js
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