I've switched to 14.04, and my script with the commands I'm issuing is below, but I'm still getting the following in the logs:
E: Package 'cowdancer' has no installation candidate
I: unmounting dev/pts filesystem
I: unmounting run/shm filesystem
I: unmounting proc filesystem
pbuilder create failed
forking: rm -rf /var/cache/pbuilder/base-trusty-amd64.cow
-> Invoking pbuilder
#!/bin/bash
apt-get update
apt-get install -y git-core
cd /usr/src
cd freeswitch
cat >/tmp/modules.conf <<'EOL'
applications/mod_commands
applications/mod_conference
applications/mod_db
applications/mod_dptools
applications/mod_enum
applications/mod_esf
applications/mod_esl
applications/mod_expr
applications/mod_fifo
applications/mod_fsv
applications/mod_hash
applications/mod_httapi
applications/mod_spandsp
codecs/mod_amr
codecs/mod_bv
codecs/mod_g723_1
codecs/mod_g729
codecs/mod_h26x
codecs/mod_vp8
codecs/mod_speex
dialplans/mod_dialplan_asterisk
dialplans/mod_dialplan_xml
endpoints/mod_loopback
endpoints/mod_sofia
event_handlers/mod_cdr_csv
event_handlers/mod_cdr_sqlite
event_handlers/mod_event_socket
formats/mod_local_stream
formats/mod_native_file
formats/mod_sndfile
formats/mod_tone_stream
languages/mod_lua
languages/mod_spidermonkey
loggers/mod_console
loggers/mod_logfile
loggers/mod_syslog
say/mod_say_en
xml_int/mod_xml_cdr
xml_int/mod_xml_rpc
xml_int/mod_xml_scgi
EOL
export COMPONENTS="main restricted universe multiverse"
export NO_COWDANCER_UPDATE=1
./debian/util.sh build-all -ibn -z9 -f /tmp/modules.conf -c trusty