I installed Ubuntu 12.04 (with special driver support) on my Dell 5520 15R. This Ubuntu image was recommended, as the system is Ubuntu certified. The hardware is exactly as the link states.

Anyway, installation went fine, no problems there. However, after downloading and installing the latest updates, the system practically destabilized.

The first thing I noticed was random system "freeze-ups", after which I had to manually power off the PC (hold power button) Next were the HDD as well as the external USB3.0 HDD which didn't spin down, nor power off (not even --detach would work).

I reinstalled, didn't update and everything is working fine again.

Are system updates incompatible with this "special" Ubuntu image? Will another update attempt yield the same results?

Thanks in advance.