Cannot install 2.8.0 on Ubuntu 12.04 from buildbot

Good day.

I'm trying to install LinuxCNC 2.8.0 as per guide on buildbot page.
Have added the key, and updated the repository list accordingly:

Precise (arch: i386) deb buildbot.linuxcnc.org/ precise 2.8-rt
realtime with RTAI deb-src buildbot.linuxcnc.org/ precise 2.8-rt

The system has the most recent updates, but if I try to install linuxcnc, I get the following error:

linuxcnc@LinuxCNC:~$ sudo apt-get -y install linuxcnc
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
linuxcnc : Depends: linux-image-3.4-9-rtai-686-pae but it is not installable
Depends: rtai-modules-3.4-9-rtai-686-pae but it is not installable or
rtai-modules-3.4-9 but it is not installable
Recommends: linuxcnc-doc-en but it is not going to be installed or
linuxcnc-doc
Recommends: python-pyqt5 but it is not installable
Recommends: python-pyqt5.qsci but it is not installable
Recommends: python-pyqt5.qtopengl but it is not installable
Recommends: python-pyqt5.qtsvg but it is not installable
Recommends: python-pyqt5.qtwebkit but it is not installable
Recommends: python-opencv but it is not going to be installed
Recommends: python-rsvg but it is not going to be installed
Recommends: python-dbus.mainloop.pyqt5 but it is not installable
Recommends: gstreamer1.0-tools but it is not installable
Recommends: python-espeak but it is not going to be installed
Recommends: pyqt5-dev-tools but it is not installable
Recommends: hostmot2-firmware-all but it is not installable
E: Unable to correct problems, you have held broken packages.

I have tried 2.7.0 and 2.9.0 as well. The only difference in the amount of recommended packages. In all cases it cannot find linux kernel image.
Any idea, guys?