QGIS » QGIS Application

Under qt5/python3, the plugin manager fails to install plugins. The following error pops up:

ImportError: No module named 'quickexport' 
Traceback (most recent call last):
  File "/home/webmaster/apps/share/qgis/python/qgis/utils.py", line 333, in startPlugin
    plugins[packageName] = package.classFactory(iface)
  File "/home/webmaster/.qgis-dev//python/plugins/QuickExport/__init__.py", line 26, in classFactory
    from quickexport import QuickExport
  File "/home/webmaster/apps/share/qgis/python/qgis/utils.py", line 642, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
ImportError: No module named 'quickexport'

Python version: 3.5.2+ (default, Sep 17 2016, 12:08:10) [GCC 6.2.0 20160914] 
QGIS version: 2.99.0-Master Master, f784e1e 

Python Path:
/home/webmaster/apps/share/qgis/python/plugins/processing
/home/webmaster/apps/share/qgis/python
/home/webmaster/.qgis-dev//python
/home/webmaster/.qgis-dev//python/plugins
/home/webmaster/apps/share/qgis/python/plugins
/usr/lib/python35.zip
/usr/lib/python3.5
/usr/lib/python3.5/plat-x86_64-linux-gnu
/usr/lib/python3.5/lib-dynload
/usr/local/lib/python3.5/dist-packages
/usr/lib/python3/dist-packages
/home/webmaster/.qgis-dev//python

One thing jumps at me straight away: the python paths within my .qgis-dev directory are wrong (double slashes, for e.g. /home/webmaster/.qgis-dev//python/plugins)

1. Launch QGIS (built against Qt5/python3)
2. Open the plugin manager
3. Select a plugin from the QGIS repository that isn't installed on your computer, and click on the [ Install plugin ] button
4. Take note of the failure