[SOLVED] RPi1 upgrade error today.

[Skywatch]

OK, I modified the mirror and still the same happens....

Terminal

xbian@lounge ~ $ sudo apt-get install libcec
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libcec is a virtual package provided by:
libcec3 3.0.1-1~xbian-1453441848 [Not candidate version]

E: Package 'libcec' has no installation candidate
xbian@lounge ~ $

---

OK - I have this sorted now! Phew!

From memory the process was.....

Change the mirror
apt-get clean
apt-get update
apt-get -f install
apt-get update
apt-get upgrade (from xbian-config)

Now all packages are back to the latest versions.

What could have caused this and can I prevent it in the future?