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In Ubuntu 12.04 I was used to run the 'Disk Utility' and choose 'Check Filesystem'; its subtitle showed also 'and repair'. In Ubuntu 16.04 I have only found the 'Disks' utility that looks similarly but has no 'Check Filesystem' option, even for the superuser.

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  • 2
    Great... gnome continues to remove useful features...
    – psusi
    Commented Sep 8, 2017 at 1:24
  • 1
    in Ubuntu 18.04, the 'Disks' utility has those options again (Check Filesystem and Repair Filesystem).
    – Georg Jung
    Commented Jun 24, 2018 at 14:56

2 Answers 2

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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
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  • Now I urgently need to repair partitions at an USB disk and at a flash disk. I am in a great time span and I can not afford a mistake by inventing the right commands. I beg you to tell me the commands for a partition mounted as /media/my_user/kus. I hope I can still find the system identifier for the partition. Thanks! Commented Oct 25, 2017 at 6:36
  • I can also use Ubuntu 12.04 at an old Pentium IV PC. Some things still work OK there. Which of it do you see as a more safe? Thanks! Commented Oct 25, 2017 at 6:55
  • @TomášPečený the instructions that I gave should work in most situations. What part are you having difficulty with? Your USB disk, if it's an external, is probably /dev/sdb{something}, so the fsck command would be sudo fsck -f /dev/sdb{something}.
    – heynnema
    Commented Oct 25, 2017 at 13:16
  • @TomášPečenýfsck is for ext4 linux partitions. You're trying to repair a fat partition. Either you've selected the wrong partition number to fix, or you're trying to repair a problem that requires chkdsk under Windows to repair.
    – heynnema
    Commented Oct 26, 2017 at 1:14
  • Sorry, I tried to write, than hesitated how to format, but the page took it as a comment. It appears that all is OK as I will write in further at least two comments Commented Oct 26, 2017 at 1:46
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Just some comments:

  1. To enter the GRUB menu press and hold SHIFT while booting
  2. In Recovery Mode better to choose "fsck - Check all file systems", see picture.

enter image description here

Great description here: How to Use ‘fsck’ to Repair File System Errors in Linux

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