I had checking battery state hanging
I solved it with the help of an answer on internet:
sudo apt-get --reinstall install gnome-power-manager
But now my left running applications bar is rigid, it does not disappear on wide screen.
Also in most of applications, characters are white.
What could be the problem? and what should I do?
Re: White characters
Go to the Ubuntu App Centre and download MyUnity. Don't be put off by the language in the description, the language in the program is English. You can change all parts of the font, color schemes, and themes! Besides, Unity is customizable, take advantage of it!