umount: /: target is busy

Question

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?

score 29 · Answer 1 · edited May 23 '17 at 12:39

29

Please try this commands:

umount -l /PATH/OF/BUSY-DEVICE
umount -f /PATH/OF/BUSY-NFS(NETWORK-FILE-SYSTEM)

edited May 23 '17 at 12:39

Community

answered Jan 04 '17 at 01:33

Lv1z

score 0 · Answer 2 · answered Nov 23 '18 at 06:44

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

2 Answers2