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I tried to update CUDA from 8.0 to 9.1 but I got the following error on Ubuntu 16.04.

Removing nvidia-prime (0.8.2) ...
mv: cannot move '/etc/X11/xorg.conf' to '/etc/X11/xorg.conf.04222018': Operation not permitted
dpkg: error processing package nvidia-prime (--remove):
 subprocess installed post-removal script returned error exit status 1
Errors were encountered while processing:
 nvidia-prime
E: Sub-process /usr/bin/dpkg returned an error code (1)

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