In this case the solution was:
First step:
remove those 2 sonic-visualiser files from app-install-data, they don't belong there.
Second step:
revised the authorisation of the user's /home directory:
sudo chown -R user:user /home/user
It solved all my problems!
Thank you!
In this case the solution was:
First step:
remove those 2 sonic-visualiser files from app-install-data, they don't belong there.
Second step:
revised the authorisation of the user's /home directory:
sudo chown -R user:user /home/user
It solved all my problems!
Thank you!