I have a Ubuntu VM which has an unmanaged OS disk associated with it.
I want to shrink my OS disk of size 50 GB to 40 GB. However, when i try to unmount /dev/sda1 partition it tell me
umount: /mnt: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1))
Therefore, i am unable to unmount it and then shrink it. Could anyone please help me with this?