Comment 2 for bug 1790367

This bit seems to be the relevant error message. It's from the attached VarLogDistupgradeApttermlog.gz.

Preparing to unpack .../ubuntu-defaults-nl_6_all.deb ...
Unpacking ubuntu-defaults-nl (6) over (3+4~precise1) ...
Selecting previously unselected package ubuntu-defaults-nl-nl.
Preparing to unpack .../ubuntu-defaults-nl-nl_6_all.deb ...
dpkg-divert: error: `diversion of /usr/share/rhythmbox/plugins/iradio/iradio-initial.xspf to /usr/share/rhythmbox/plugins/iradio/iradio-initial.xspf.ubuntu-defaults by ubuntu-defaults-nl-nl' clashes with `diversion of /usr/share/rhythmbox/plugins/iradio/iradio-initial.xspf to /usr/share/rhythmbox/plugins/iradio/iradio-initial.xspf.ubuntu-defaults by ubuntu-defaults-nl'
dpkg: error processing archive /var/cache/apt/archives/ubuntu-defaults-nl-nl_6_all.deb (--unpack):
 subprocess new pre-installation script returned error exit status 2
dpkg-divert: error: mismatch on package
  when removing `diversion of /usr/share/rhythmbox/plugins/iradio/iradio-initial.xspf to /usr/share/rhythmbox/plugins/iradio/iradio-initial.xspf.ubuntu-defaults by ubuntu-defaults-nl-nl'
  found `diversion of /usr/share/rhythmbox/plugins/iradio/iradio-initial.xspf to /usr/share/rhythmbox/plugins/iradio/iradio-initial.xspf.ubuntu-defaults by ubuntu-defaults-nl'
dpkg: error while cleaning up:
 subprocess new post-removal script returned error exit status 2