That did the trick, thank you! 

Now I have another problem. When I open Mnemosyne now, I get an error" 
'Unable to start sync server'.

When I start Mnemosyne from the command line, I get the following:

libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
[0211/081506:ERROR:browser_main_loop.cc(217)] Running without the SUID 
sandbox! See 
https://chromium.googlesource.com/chromium/src/+/master/docs/linux_suid_sandbox_development.md
 
for more information on developing with the sandbox on.
QIODevice::write (QProcess): device not open
QIODevice::write (QProcess): device not open
b'Waiting for uploader thread to stop...'
b'Done!'

Further help will be much appreciated! Thanks again.

On Friday, February 10, 2017 at 11:39:39 PM UTC-6, Peter Bienstman wrote:
>
> Sudo pip3 install cheroot is your friend ☺️
>
> Peter 
>
>
> ------------------------------
> *From:* eyeorama <[email protected] <javascript:>>
> *Sent:* 10 Feb 2017 21:47
> *To:* mnemosyne-proj-users
> *Subject:* [mnemosyne-proj-users] Re: Mnemosyne 2.4.1 released
>
> Just tried replacing 2.4 with 2.4.1 on Ubuntu 16.04 LTS, got this error:
>
>
> An unexpected error has occurred.
>
> Please forward the following info to the developers:
>
>
> Traceback (innermost last):
>
> File "/usr/local/bin/mnemosyne", line 4, in <module>
>
> __import__('pkg_resources').run_script('Mnemosyne==2.4.1', 'mnemosyne')
>
> File 
> "/usr/local/lib/python3.5/dist-packages/setuptools-30.2.0-py3.5.egg/pkg_resources/__init__.py",
>  
> line 739, in run_script
>
> self.require(requires)[0].run_script(script_name, ns)
>
> File 
> "/usr/local/lib/python3.5/dist-packages/setuptools-30.2.0-py3.5.egg/pkg_resources/__init__.py",
>  
> line 1501, in run_script
>
> exec(script_code, namespace, namespace)
>
> File 
> "/usr/local/lib/python3.5/dist-packages/Mnemosyne-2.4.1-py3.5.egg/EGG-INFO/scripts/mnemosyne",
>  
> line 247, in <module>
>
> File 
> "/usr/local/lib/python3.5/dist-packages/Mnemosyne-2.4.1-py3.5.egg/mnemosyne/libmnemosyne/__init__.py",
>  
> line 192, in initialise
>
> self.activate_components()
>
> File 
> "/usr/local/lib/python3.5/dist-packages/Mnemosyne-2.4.1-py3.5.egg/mnemosyne/libmnemosyne/__init__.py",
>  
> line 292, in activate_components
>
> sync_server.activate()
>
> File 
> "/usr/local/lib/python3.5/dist-packages/Mnemosyne-2.4.1-py3.5.egg/mnemosyne/pyqt_ui/qt_sync_server.py",
>  
> line 193, in activate
>
> component_manager=self.component_manager)
>
> File 
> "/usr/local/lib/python3.5/dist-packages/Mnemosyne-2.4.1-py3.5.egg/mnemosyne/pyqt_ui/qt_sync_server.py",
>  
> line 65, in __init__
>
> super().__init__(ui=self, **kwds)
>
> File 
> "/usr/local/lib/python3.5/dist-packages/Mnemosyne-2.4.1-py3.5.egg/mnemosyne/libmnemosyne/sync_server.py",
>  
> line 31, in __init__
>
> port=config["sync_server_port"], **kwds)
>
> File 
> "/usr/local/lib/python3.5/dist-packages/Mnemosyne-2.4.1-py3.5.egg/mnemosyne/libmnemosyne/component.py",
>  
> line 48, in __init__
>
> super().__init__(**kwds)
>
> File 
> "/usr/local/lib/python3.5/dist-packages/Mnemosyne-2.4.1-py3.5.egg/openSM2sync/server.py",
>  
> line 98, in __init__
>
> from cheroot import wsgi
>
> ImportError: No module named 'cheroot'
>
>
> Please help! Thanks.
>
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