Kubuntu 16.04 Beta 2 Installer crashes on installation if you change the default language

[VaryHeavy]

The installer have some problems with the keyboard layouts, because if you change the default language at the beginning of installation, when it reaches the step of selecting the keyboard layout, appears a small window with a message saying "Do you wish to keep the default keyboard layout?". In my case, I changed the default language to Spanish, and regardless of the option I choose, then appears an error message saying "ubi-console-setup failed with exit code 141. Further information may be found in /var/log/syslog. Do you want to try running this step again before continuing? If you do not, your installation may fail entirely or may be broken" and then we have 3 options: Retry, Ignore or Cancel. If I choose 'Retry', the same process is repeated. If I choose 'Ignore', I can continue until the final installation step and during the installation, the installer crashes. If I choose 'Cancel', the installer closes alike. I don't know if it occurs with more languages, but if I change the Spanish language, to reach the step of selecting the keyboard layout, happens what you see in the attached images.

It's really serious that a bug like this is present to a week of the official release.

Here I attach the files /var/log/syslog and /var/log/partman, and 3 screenshots:
-> syslog: https://www.sendspace.com/file/ebbhwp
-> partman: https://www.sendspace.com/file/qhzn1h
-> Screenshot 1: https://www.sendspace.com/file/2tx3sj
-> Screenshot 2: https://www.sendspace.com/file/ko9e4x
-> Screenshot 3: https://www.sendspace.com/file/eq87or

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.