For months now Allwinner has been violating the GPL and have attempted to cover it up by obfuscating their code and playing around with their licenses while jerking around the open-source community. At least today they've made a positive change in open-sourcing more of their "CedarX" code.
About 6 years ago, I wrote an article about why I felt that installing software in GNU/Linux was broken. It pains me to say that the situation is, sadly, exactly the same:GNU/Linux never made it to personal computers, really, and at this point it looks like it never will.
UK Government Analyzes Ubuntu 14.04 LTS Security
The UK government releases every year a security guidance that details various problems and security problems that are identified in systems used by the authorities. They also revealed some issues with Ubuntu 14.04 LTS, although it's not something major.