Hi all,
after all the discussion about getting Frescobaldi to run on distributions
based on Ubuntu < 17.xx I decided to give it a shot myself.
TL;DR Frescobaldi *can* be installed on Ubuntu 16.04/Mint 18.3 from its own Git
repositories and the Ubuntu package repositories without issues.
Context/Situation:
I freshly installed Linux Mint 18.3.
(NOTE: I use a previously existing $HOME directory, but I'm quite sure this
doesn't affect the process)
Mint 18.3 is based on Ubuntu 16.04 (Mint 19 will be based on Ubuntu 18.04, the
next LTS release),
and the relevant packages are from the Ubuntu repositories (so no Mint
specifics added), which means I assume the behaviour on vanilla Ubuntu 16.04 is
the same.
Commented installation steps:
# Make sure everything is up-to-date
sudo apt update && sudo apt upgrade
sudo apt install git
# Install Frescobaldi's primary dependencies
sudo apt install python3-pyqt5 python3-pyqt5.qtsvg python3-pyqt5.qtwebkit
# Obtain the Git repositories
# (I *assume* these could instead be downloaded from Github as ZIP files)
cd ~
mkdir git # this is just my personal base directory for Git repositories
cd git
git clone https://github.com/wbsoft/python-ly.git python-ly
git clone https://github.com/wbsoft/frescobaldi.git frescobaldi
First try to run Frescobaldi: Invoke python3 with the frescobaldi entry file
and add python-ly to the Python search path:
PYTHONPATH=$PYTHONPATH:~/git/python-ly python3 ~/git/frescobaldi/frescobaldi
Frescobaldi correctly starts up, but (expectedly) doesn't show the Music View
because the Poppler package isn't installed.
# Install the Poppler bindings from the Ubuntu repositories
sudo apt install python3-poppler-qt5
After that Frescobaldi correctly starts and shows scores both in the Music View
and in the SVG View.
Knowing this one could have installed all dependencies with one single
sudo apt install python3-pyqt5 python3-pyqt5.qtsvg python3-pyqt5.qtwebkit
python3-poppler-qt5
###
I don't know enough about this and I can't investigate on a "broken" computer,
but I have a suspicion.
The issue is that we have Qt, an application framework written in C++.
Frescobaldi is written in PyQt, which is a set of Qt "bindings" for Python, so
Python programs can use the Qt infrastructure.
The point is that all bindings packages (which includes the general PyQt
infrastructure and the custom bindings for the Poppler library that is used to
display PDF documents) have to be "compiled against" and with the exact
versions of Qt and Python that are installed on the system.
Generally this is an aspect that should be taken care of by a Linux
distribution's package management system, and my latest try indicates that this
works correctly with Ubuntu 16.04 (by now?).
My suspicion is that when using pip (or pip3) for installing the Python
packages these relations are in some way incorrect, maybe they interfere with
packages installed through APT.
Similarly, when using the setup.py script in the Frescobaldi installation
directory things seem not to work correctly.
Finally it is maybe not clear enough in the instructions that *everything*
(i.e. Ubuntu packages and pip) have to be used in their python3 versions.
So my final recommendation is: Use Ubuntu's packages and install everything
through APT, and avoid pip3 or setup.py.
I will update the Wiki page
(https://github.com/wbsoft/frescobaldi/wiki/Installing-Frescobaldi-3-on-Linux-(package-source),
note that I have renamed it) and try to make everything as clear as possible.
But I wanted to share this result and encourage people using Ubuntu 16.04 to
test and verify it.
Best
Urs
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