Comment 5 for bug 1641790

Verified fixed with 8.1.8-1ubuntu0.1.

$ sudo apt install python3-pytango=8.1.8-1 --no-install-recommends
[...]
Setting up python3-pytango (8.1.8-1) ...
  File "/usr/lib/python3/dist-packages/PyTango/tango_gevent.py", line 56
    raise result.error_string, None, result.tb
                             ^
SyntaxError: invalid syntax

dpkg: error processing package python3-pytango (--configure):
 subprocess installed post-installation script returned error exit status 1

$ sudo apt install python3-pytango=8.1.8-1ubuntu0.1 --no-install-recommends
[...]
Preparing to unpack .../python3-pytango_8.1.8-1ubuntu0.1_amd64.deb ...
Unpacking python3-pytango (8.1.8-1ubuntu0.1) over (8.1.8-1) ...
Setting up python3-pytango (8.1.8-1ubuntu0.1) ...
$