I have almost the same problem. But my option is not to hibernate but to shutdown. I noticed this issue on Ubuntu 16.04 with Unity, lubuntu, ubuntu mate on diverse computers. I customised with dconf on Unity,the critical level battery to 20% but it won't to shutdown at this critical level, computer works till the end of the battery!
I have almost the same problem. But my option is not to hibernate but to shutdown. I noticed this issue on Ubuntu 16.04 with Unity, lubuntu, ubuntu mate on diverse computers. I customised with dconf on Unity,the critical level battery to 20% but it won't to shutdown at this critical level, computer works till the end of the battery!