Ubuntu – Installing textext-0.4.4 in Inkscape 0.91

I am trying to install textext-0.4.4 in Inkscape 0.91.
I am on Ubuntu 15.04.

I follow the same procedure for Ubuntu 14.04, but it does not work.

1. Install Pstoedit and pdflatex

2. download textext-0.4.4.

3. move LICENSE.txt, textext.inx, textext.py in ~/.config/inkscape/extensions/

4. start inkscape

Unfortunately, under extensions I do not see Tex Text.

Output from ls -la ~/.config/inkscape/extensions/

total 96
drwxr-x--x 2 werty werty  4096 Jul 10 20:28 .
drwxr-x--x 7 werty werty  4096 Jul 10 12:46 ..
-rw-r----- 1 root   root    1522 Jul 10 13:01 LICENSE.txt
-rw------- 1 root   root     415 Jul 10 13:01 textext.inx
-rwxr-x--- 1 root   root   32240 Jul 10 20:28 textext.py
-rwxr-x--- 1 root   root   45867 Jul 10 20:28 textext.py~

Output from sudo ~/.config/inkscape/extensions/textext.py

Traceback (most recent call last):
  File "/home/oftefs/.config/inkscape/extensions/textext.py", line 933, in <module>
    e.affect()
  File "/usr/share/inkscape/extensions/inkex.py", line 262, in affect
self.svg_file = args[-1]
IndexError: list index out of range

Any suggestion?