@Dan,
The way I used to change Nvidia driver version is to purge existed one then 
install newer.

detail steps:
1. switch to another tty console by alt-ctl + F${what-ever-number-you-want}
2. systemctl stop lightdm
3. dpkg -l | grep ${your-current-nv-driver-number} | awk '{print $2}' | xargs 
sudo apt-get purge -y
4. sudo apt-get install nvidia-${the-version-you-want}

please make sure that you can install nvidia-${the-version-you-want}
before purging old drivers, otherwise it might get boot failure in next
boot.

-- 
You received this bug notification because you are a member of compiz
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https://bugs.launchpad.net/bugs/1292830

Title:
  Resuming from sleep makes black borders around windows appear

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