Epson TM-T20 problems CUPS 1.5.3 Ubuntu 12.04x64

Hi, I'm using a TM-T20 thermal printer. In Ubuntu 12.04x64 with CUPS 1.5.3 The printer is serial and I'm using a serial to USB cable in order to use it in a laptop.

Driver readme:

---------------------------------------------------------------------
3. Operational environment
---------------------------------------------------------------------

This software supports the following environments.
Operations in an unsupported environment are not guaranteed.

* Operating System
  - openSUSE 11.1
  - Ubuntu 9.04

* Hardware:
  - Intel x86(32bit) architecture.
  - Intel x86_64(64bit) architecture.

* Related software
  - CUPS Ver.1.1.23 or later
      <http://www.cups.org/>

I connected the cable and check the CUPS web interface in order to install the printer, it doesn't work.

Then I added it with this command :

sudo lpadmin -p tm-t20 -E -v serial:/dev/ttyUSB0 -P /usr/share/ppd/epson-tm-t20-rastertotmt.ppd

But before I made chmod 777 /dev/ttyUSB0 (I have to this each time I want to use the printer).

Then the printer appeared at the web interface and I just added following the instructions (selecting the correct driver and giving the PPD).

Then the printer started to working, but wasting paper (no matter what I send to it, it prints 30 cm of paper always), then I use options:

lp -d tm-t20 -o media=Custom.200x258 -o source=DocFeedCut document.ps

Then I tried with different options of paper size, until I find the best:

lp -d tm-t20 -o media=Custom.210x220 -o source=DocFeedCut document.ps

But another day. I tried to print and the printer was simply not cutting the page, then sometimes it print or sometimes not (always whitout cutting the paper) and CUPS web interface tells me that the Job has been finished. Sometimes prints garbage. Then I change the cable serial to USB, but nothing happens.

Sometimes I get this error:

tm-t20-212 Unknown Withheld 2k 1 stopped
"/usr/lib/cups/filter/pstopdf failed"

If I try with just plain Text:

The first time I turn it On prints, then stops printing and in the web Interface I see job completed.

In the logs appears this:

W [28/Sep/2012:14:35:43 -0300] failed to CreateDevice: org.freedesktop. ColorManager.AlreadyExists:device id 'cups-tm-t20' already exists

I tried changing almost every option of the printer.

EDIT:

After installing / reinstalling CUPS (1.5.3) and epson driver, the printer now just prints garbage.

someone using this printer in Ubuntu? what should I do?