two simple command when try umount device and it is busy:
fuser -km /media
umount /media
two simple command when try umount device and it is busy:
fuser -km /media
umount /media
sudo gedit /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf
Paste the following into the file:
Section “Device”
Identifier “Device0”
Driver “nvidia”
VendorName “NVIDIA Corporation”
BoardName “Quadro K1000M”
Option “RegistryDwords” “EnableBrightnessControl=1”
EndSection