In mid June, my laptop hard disk died. Suddenly, there was a flurry of disk I/O wait, then applications started to report errors trying to write anything.
With a 500GB 2.5" laptop disk lying around that was used for backup, I replaced the dead disk with this one.
I had an Ubuntu Server 14.04 CD lying around, and therefore did not bother to download Kubuntu 14.04.
My laptop's home directory is backed up daily via ssh to the server. So my data was safe.