system-config-lvm error

[Prateek Donni]

I recd. this error while trying to resize  root partition thru lvm
using the system-config-lvm utility :

umount command failed. Command attempted: "/bin/umount /" - System
Error Message: umount: /: device is busy
umount: /: device is busy


However using command line it works absolutely fine.
Why does this happen ?
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