Re: Read-only file system error when installing a package

[Steven Evans]

    Thanks so much, Mike.  That did, indeed, solve the problem. 
However, now I have another one.
    After typing "pkg install -forge parallel" at the Octave prompt, I 
receive an error message which says:

pkg: error running `make' for the parallel package.
error: called from
    configure_make at line 99 column 9
    install at line 184 column 7
    pkg at line 441 column 9

    Before printing out this error, it prints out a lot of other 
things, of which, I'm embarrassed to say that I don't fully understand.  
I copied everything that it prints out and pasted it into a text file, 
which I've attached to this message.
    In your message, you said that I was trying to do a global 
install.  Does typing "pkg install -forge parallel" mean that I'm trying 
to do a global install?
    I typed "pkg install -forge parallel", based on a webpage which 
speaks about the parallel package:

https://wiki.octave.org/Parallel_package

    At the top of that page, it says to type "pkg install -forge 
parallel" in order to install the package.  Does this cause the global 
install that you're talking about?
    Would it matter that I now have two versions of Octave installed?  
I tried to install the parallel package on the version of Octave that I 
have originally (version 4.0.0).  When trying to install the package, I 
received a message which said:

error: the following dependencies were unsatisfied:
   parallel needs struct >= 1.0.12

    I figured I was receiving the message because my version of Octave 
was too old for the package.  So I installed version 5.0.1 using 
flatpack.  It turns out that I can still use my old version of Octave by 
typing "octave-cli" at a Linux command prompt.  In order to run the new 
version, I type "flatpak run org.octave.Octave".  Is it a problem for me 
to have the two versions?
    I realized the version wasn't the cause of the struct issue when I 
tried to install the parallel package on version 5.0.1, and still got 
the struct message.  I later found out that I'm receiving that message 
because I have to install struct, which is a different package.  So I 
installed that package by typing "pkg install -forge struct", on my 
5.0.1 version of Octave.  I then tried to install the parallel package, 
which gave me the error in the attached text file.
    I'm not sure whether any of that is related to this error message 
about 'make' not running correctly, but I figured it wouldn't hurt to 
let you know.
    Thanks again for your help on how to get beyond my "read-only" 
issue.  Could this new issue be related to the global install that you 
mentioned earlier?

Thanks for your time and patience,

Steven




On 05/18/2019 03:08 PM, Mike Miller wrote:
> On Sat, May 18, 2019 at 12:01:11 -0400, Steven Evans wrote:
> >      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.
> This error message occurs because you are trying to do a "global"
> package install into the /app filesystem in Flatpak, which is indeed a
> read only filesystem. So this error message is correct.
>
> But the reason you are doing a "global" package install is because...
>
> >      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.
> Yes, it definitely matters, don't run Flatpak apps with sudo.
>
> >      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.
> The error in your screenshot means you have probably run Octave with
> sudo at some point in the past, and Ubuntu's sudo configuration is
> weird. Try
>
>      sudo rm -rf /home/evansste/.config/octave
>
> to delete the root-owned files in your home directory, then run Octave
> again as your own user.
>
> Running a user application with sudo is hardly ever a good idea.
>
> >      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?
> Please try the above and let us know if it works.

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