Read-only file system error when installing a package

[Steven Evans]

    When trying to install Octave's parallel package, I receive the 
following error:

warning: creating installation directory /app/share/octave/packages
warning: called from
    install at line 30 column 5
    pkg at line 441 column 9
error: could not create installation directory: Read-only file system
error: called from
    install at line 33 column 7
    pkg at line 441 column 9

    I receive this error after typing "pkg install -forge parallel" at 
the Octave prompt.
    My operating system is Lubuntu 16.04.  I recently installed the 
latest version of Octave (version 5.1.0) using Flatpak.
    I don't know if this matters, but after installing Octave, I have 
to put "sudo" in front of the "flatpak run org.octave.Octave" command, 
when starting Octave.
    I got this run command by following the instructions at the bottom 
of this page:

https://flathub.org/apps/details/org.octave.Octave

    In order to start Octave via the command line, it says to type 
"flatpak run org.octave.Octave".  However, if I don't put "sudo" before 
this,  a window pops up saying I don't have read and write permissions.  
I've attached a screen shot of this, so that you'll see what I mean.  
That error message gave me the idea of putting "sudo" before the 
command; which seems to work.
    Because I received that error by not using "sudo", I'm wondering if 
that could be related to me not being able to install the parallel 
package.  If so, what am I doing wrong? Any ideas on how to fix this?

Thanks for your time and attention,

Steven Evans

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