When I ran the command

umount /dev/mapper/ubuntu--gnome--vg-root I I got :

umount: /: target is busy
        (In some cases useful info about processes that
         use the device is found by lsof(8) or fuser(1).)

I tried some different options with the command lsof and fuser, but it didn't work so far.

Does anyone have any idea how to resolve this issue?

  • What issue, exactly? are you really trying to unmount the root filesystem of your running OS? Jan 4, 2017 at 1:30
  • This is a LVM partiton. I'm not an expert, but I should be able to resize this partition, but it is not the case actually.
    – user636872
    Jan 4, 2017 at 1:31

2 Answers 2


Please try this commands:


Reference: https://stackoverflow.com/questions/7878707/umount-a-busy-device


try these:

dmsestup ls

if your output contain "ubuntu--gnome--vg-root" then try to deactivate lvm volume at first, then try to umount your volume:

lvchange -an "Path-to-Your-LVM-Volume (in this case: /dev/mapper/ubuntu--gnome--vg-root)"

umount /dev/mapper/ubuntu--gnome--vg-root

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