Comment 19 for bug 1492146

sudo apt-get -y purge linux-{headers,image}-3.16.0-48-generic
sudo apt-get -y install linux-generic-lts-vivid

sudo reboot [0]

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  linux-headers-3.16.0-46 linux-headers-3.16.0-46-generic
  linux-headers-3.16.0-48 linux-image-3.16.0-46-generic
Use 'apt-get autoremove' to remove them.