Quoting Stefanie Dargel <nasenbaer8...@gmail.com>:
gajim in stretch-backports fails to start with:
"Gajim needs python-nbxmpp >= 0.6.1 to run. Quitting..."
This is strange. I'm using the backport myself at work, so it is a
typical "works for me" :~)
python3-nbxmpp 0.6.2-1~bpo9+1 and python-nbxmpp 0.6.2-1~bpo9+1 are
installed.
The first one is needed, indeed, the second one not.
Could you try the following in the console/terminal:
$ python3
import nbxmpp
nbxmpp.__version__
'0.6.2'
If the output is not 0.6.2, you have maybe installed a different
version of the nbxmpp library manually somewhere and Gajim picks
the wrong one.
For questions, you can also reach me via XMPP (jid == email).
If you have a working XMPP client...