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I have this problem, please help me! I don't want to reinstall ubuntu as I've done several times

nico@home:~$ sudo umount /dev/sda3
umount: /: target is busy.
nico@home:~$ fsck
fsck from util-linux 2.37.2
e2fsck 1.46.5 (30-Dec-2021)
/dev/sda3 is mounted.

WARNING!!!  The filesystem is mounted.   If you continue you *WILL*
cause *SEVERE* filesystem damage.


Do you really want to continue<n>? no
check aborted.
fsck.fat 4.2 (2021-01-31)
open: Permission denied
TommyPeanuts
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Nicolás Gargano
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    You can't fsck your mounted disk safely. You need to boot into a LiveUSB / Installer environment and run the fsck from there. – Thomas Ward Oct 25 '23 at 20:08
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    you also can't fsck without sudo on a normal prompt And why would you consider doing fschk on a partition/disk that is in use? If the directory where you did this from on /dev/sda3 perhaps? Or do you have another session open? if so umount will fail – Rinzwind Oct 25 '23 at 20:56
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    Does this answer your question? Running fsck manually – guiverc Oct 25 '23 at 21:26
  • You need to boot into a LiveUSB / Installer environment and run the fsck from there. I've tried that, but I can't acced to the directory – Nicolás Gargano Oct 26 '23 at 13:21

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