Tried to install emacs-snapshot from ppa:cassou/emacs.  apt-get says:

!! Byte-compilation for emacs-snapshot failed!
!! This indicates a bug in one of the add-on packages
!! installed on your system, or a bug in Emacs itself.
!! Please file a bug report against emacs-snapshot
!! and attach the file /tmp/emacs-snapshot.rrQsds
dpkg: error processing emacs-snapshot (--configure):
 subprocess installed post-installation script returned error exit status 1

Here is the tmp file: