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[Bruno Nova <1412729@xxxxxxxxxxxxxxxxxx>]

I just tested this in a VirtualBox VM (which contains a very "vanilla" 14.04 install with very few extra packages installed), and it didn't work.
I tried several times. The Epson repository is added successfully, but it hangs while it's installing the driver package (epson-inkjet-printer-nx420). The package is not installed.

The last output of "system-config-printer --debug" is:
  pk.refresh_cache succeeded
  pk.resolve
  pk.resolve succeeded
  package_id: epson-inkjet-printer-nx420;1.0.0-1lsb3.2;amd64;printdriver
  package not installed
  pk.install_packages
  Signature key supplied

After this, when I try to install the package manually, it fails because /var/cache/debconf/config.dat (and other files there) is locked by another process.
Here are the relevant lines (I think) of "ps aux":
  root      3331  0.0  0.0      0     0 pts/0    ZN+  16:57   0:00 [dpkg] <defunct>
  root      3332  0.0  0.0   4444   648 pts/0    SN+  16:57   0:00 /bin/sh -c /usr/sbin/dpkg-preconfigure --apt || true
  root      3333  0.0  1.0  64128 15628 pts/0    SN+  16:57   0:00 /usr/bin/perl -w /usr/sbin/dpkg-preconfigure --apt
  root      3335  0.0  0.0      0     0 pts/0    ZN+  16:57   0:00 [dpkg-preconfigu] <defunct>

However, if I install the packages "alien", "build-essential" and "lsb" before installing the printer through system-config-printer, the installation completes successfully.
Also, there was one time when apt failed to install the driver package (manually) because one of the dependencies, which was "lsb", was not properly configured.
So, is sytem-config-printer failing to configure a package (i.e. debconf), or is this a quirk with Virtualbox?

Another note. The driver installation window is too large to fit in my
1366x768 monitor, so the buttons in the bottom are not visible.

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https://bugs.launchpad.net/bugs/1412729

Title:
  system-config-printer crashes when assigning a downloadable non-free
  Epson driver to a detected printer

Status in system-config-printer package in Ubuntu:
  Fix Released
Status in system-config-printer source package in Trusty:
  Fix Committed
Status in system-config-printer source package in Utopic:
  Fix Released

Bug description:
  If a newer Epson printer which is not (yet) supported by Gutenprint is
  connected and set up, system-config-printer crashes when it finds the
  appropriate driver package from Epson via OpenPrinting. This is due to
  the fact that the Epson driver entries on the OpenPrinting web site do
  not contain the long license textst inline but in one centralized text
  file on Epson's web site. The driver entries only contain links to
  this file.

  system-config-printer does only support inline license texts and
  crashes on this kind of driver entries.

  [Impact]

  Users of newer Epson inkjet printers are not able to set up their
  printers because system-config-printer crashes when choosing such a
  printer in the list of detected printers.

  [Test Case]

  If you do not have one of the mentioned printers, create a file named
  /usr/lib/cups/backend/testbackend containing the line

  echo 'direct usb://EPSON/XP-215%20217%20Series "EPSON XP-215 217
  Series" "EPSON XP-215 217 Series"
  "MFG:EPSON;CMD:ESCPL2,BDC,D4,D4PX,ESCPR2;MDL:XP-215 217
  Series;CLS:PRINTER;DES:EPSON XP-215 217 Series;" ""'

  and make it world-readable and -executable:

  sudo chmod a+rx /usr/lib/cups/backend/testbackend

  This emulates an Epson XP-215/217 printer on USB, at least for CUPS'
  printer discovery facility.

  Start system-config-printer and click the "Add" button. In the printer
  setup wizard choose the Epson XP-215 217 Series printer under the
  detected printers. There will pop up "Searching driver" messages
  several times but in the end system-config-printer crashes.

  With the proposed packages for Utopic and Trusty the driver selection
  screen will appear offering to download Epson's driver for this
  printer and after accepting the license the driver gets installed and
  the printer set up with this driver.

  [Regression Potential]

  Regression potential is low, as the fix only affects the code for
  retreiving the driver database record from OpenPrinting and displaying
  it on the driver selection screen. All other functionality of system-
  config-printer is unchanged.

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