I`ve found solution to problem - I had a password of root user. So I entered in terminal "sudo passwd -d root" -> then rebooted and problem with battery has gone!
** Changed in: gnome-power-manager (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/1304385 Title: Gnome-power-manager doesn't have permission to shutdown PC To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/1304385/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs