I also have this issue with the Epson Stylus Office BX305FW Plus. Bother version 1.0.0 (recommended) and version 1.2.0 are affected. I am running Ubuntu 12.04 LTS Precise Pangolin with all the latest updates.

The following is the output from /var/log/jockey.log:


2012-07-17 10:32:39,783 DEBUG: Installing package: epson-inkjet-printer-escpr
2012-07-17 10:32:39,783 DEBUG: repository_enabled(deb http://download.ebz.epson.net/dsc/op/stable/debian/ lsb3.2 main): checking /etc/apt/sources.list
2012-07-17 10:32:39,783 DEBUG: repository_enabled(deb http://download.ebz.epson.net/dsc/op/stable/debian/ lsb3.2 main): checking /etc/apt/sources.list.d/google-chrome.list
2012-07-17 10:32:39,783 DEBUG: repository_enabled(deb http://download.ebz.epson.net/dsc/op/stable/debian/ lsb3.2 main): no match
2012-07-17 10:32:39,783 DEBUG: install_package(): adding repository deb http://download.ebz.epson.net/dsc/op/stable/debian/ lsb3.2 main
2012-07-17 10:32:43,820 DEBUG: _add_repository(): Updating apt lists
2012-07-17 10:32:43,856 DEBUG: index download progress 0.000000
2012-07-17 10:32:43,857 DEBUG: index download progress 0.000000
2012-07-17 10:32:43,980 DEBUG: index download progress 0.000000
2012-07-17 10:32:44,241 DEBUG: index download progress 0.000000
2012-07-17 10:32:44,506 DEBUG: index download progress 25.000000
2012-07-17 10:32:44,506 DEBUG: index download progress 25.000000
2012-07-17 10:32:44,507 DEBUG: index download progress 25.000000
2012-07-17 10:32:44,772 DEBUG: index download progress 33.333333
2012-07-17 10:32:44,773 DEBUG: index download progress 33.333333
2012-07-17 10:32:44,773 DEBUG: index download progress 33.333333
2012-07-17 10:32:45,037 DEBUG: index download progress 25.000000
2012-07-17 10:32:45,037 DEBUG: index download progress 25.000000
2012-07-17 10:32:45,038 DEBUG: index download progress 25.000000
2012-07-17 10:32:45,302 DEBUG: index download progress 28.571429
2012-07-17 10:32:45,302 DEBUG: index download progress 28.571429
2012-07-17 10:32:45,303 DEBUG: index download progress 28.571429
2012-07-17 10:32:45,570 DEBUG: index download progress 31.250000
2012-07-17 10:32:45,570 DEBUG: index download progress 33.333333
2012-07-17 10:32:45,571 DEBUG: index download progress 33.333333
2012-07-17 10:32:45,837 DEBUG: index download progress 33.333333
2012-07-17 10:32:45,837 DEBUG: index download progress 33.333333
2012-07-17 10:32:45,838 DEBUG: index download progress 33.333333
2012-07-17 10:32:45,838 DEBUG: index download progress 33.333333
2012-07-17 10:32:46,108 DEBUG: index download progress 33.333333
2012-07-17 10:32:46,108 DEBUG: index download progress 33.333333
2012-07-17 10:32:46,372 DEBUG: index download progress 33.333333
2012-07-17 10:32:46,373 DEBUG: index download progress 33.333333
2012-07-17 10:32:46,637 DEBUG: index download progress 33.333333
2012-07-17 10:32:46,637 DEBUG: index download progress 33.333333
2012-07-17 10:32:46,900 DEBUG: index download progress 33.333333
2012-07-17 10:32:46,901 DEBUG: index download progress 33.333333
2012-07-17 10:32:47,164 DEBUG: index download progress 33.333333
2012-07-17 10:32:47,165 DEBUG: index download progress 33.333333
2012-07-17 10:32:47,428 DEBUG: index download progress 33.333333
2012-07-17 10:32:47,428 DEBUG: index download progress 33.333333
2012-07-17 10:32:47,692 DEBUG: index download progress 33.333333
2012-07-17 10:32:47,692 DEBUG: index download progress 33.333333
2012-07-17 10:32:47,957 DEBUG: index download progress 70.000000
2012-07-17 10:32:47,958 DEBUG: index download progress 70.000000
2012-07-17 10:32:48,222 DEBUG: index download progress 80.000000
2012-07-17 10:32:48,486 DEBUG: index download progress 80.000000
2012-07-17 10:32:48,486 DEBUG: index download progress 80.000000
2012-07-17 10:32:48,487 DEBUG: index download progress 80.000000
2012-07-17 10:32:48,750 DEBUG: index download progress 90.000000
2012-07-17 10:32:49,492 ERROR: Binary package epson-inkjet-printer-escpr has no trusted origin, rejecting