[Koha-devel] installed the 3.0.2 version , appears without CSS style sheet

Hello Friends I write from Bolivia, I have installed the 3.0.2 version of Koha, and I have the following problem. The first you see when I install everything works fine and Spanish, and when my machine reboot KOHA change the interface switches to English and appears without CSS style sheet. Install Ubuntu. Can anyone help me please. Thank you. Christian Jhonny Calle Jahuira La Paz - Bolivia