Comment 21 for bug 1257791

@mhb, you should be able to do the following with the phone connected to your computer (you can skip the first step if your image is already writeable):

adb shell touch /userdata/.writable_image && adb reboot

After phone reboots execute the following:

wget http://bazaar.launchpad.net/~vthompson/ubuntu-terminal-app/backspace-and-enter-workaround/download/head:/scrlkeys.qml-20130506190234-93itbo4vrf9j05mi-5/ScrlKeys.qml && adb push ScrlKeys.qml /usr/share/click/preinstalled/com.ubuntu.terminal/current/extraPanel/

The "Text ctrl keys" panel should now have a BACKSPACE and ENTER button--however the text will be fairly unreadable (that's another issue).