[ubuntu-studio-users] Next Gimp issue - no python

[Ross Gammon]

In case it helps. The Focal (20.04) Release Notes have some information
about the "Python 3 by default" change. How to handle it depends on
whether it is a fresh install, or an upgrade.
https://wiki.ubuntu.com/FocalFossa/ReleaseNotes

On 11/05/2020 23:52, BabsKy wrote:
> I just checked the US 20.04 beta (run from disc) and that has loads of
> '/usr/bin/env: ‘python’: No such file or directory' too, and no python.
> Did the update alternatives, now getting loads of "from gimpfu import
> * ModuleNotFoundError: No module named 'gimpfu'" errors. 
> These errors are for the .py scripts now 'built in' to Gimp.
> There's more people with the same issue online now than there was
> yesterday but the only solutions are either get the appimage or use Gimp
> on Windows 😟 I really don't want to do either of those but if I get too
> stuck I'll probably go with the appimage option and hold out for a
> better solution.
> Thanks for all your help Ross 👍
> 
> 
> On Mon, 11 May 2020 at 21:25, Ross Mohn <rpmohn at waxandwane.org
> <mailto:rpmohn at waxandwane.org>> wrote:
> 
>     The update-alternatives command should create the
>     /etc/alternatives/python link for you just fine.
> 
>     On 5/11/20 3:56 PM, BabsKy wrote:
>>     Sorry, had to dogsit for a bit.
>>     env is in usr/bin, don't know how I missed it before.
>>     There are a few pythons in usr/bin (2 (link to py2.7), 2.7 (shared
>>     lib), 3 (link to py3.8), 3.8 (exe), and a few more py 3) but none
>>     in alternatives. 
>>     Setting usr/bin/python to point to /etc/alternatives/python won't
>>     work if it's not there.
>>
>>     Do I have to set the python path environment variable? I'm only
>>     guessing but is 'env' a list of environment variables? All I know
>>     is that it's a library. 
>>      
>>
>>
>>     On Mon, 11 May 2020 at 19:26, Ross Mohn <rpmohn at waxandwane.org
>>     <mailto:rpmohn at waxandwane.org>> wrote:
>>
>>         Take a look at what python stuff is in /usr/bin right now.
>>         There should be several symbolic links.
>>
>>             * ls -l /usr/bin/python* /etc/alternatives/python*
>>
>>         My guess is that /usr/bin/python is either missing altogether
>>         or is pointing to some version of python2 that has been
>>         removed. If you run this command it will set /usr/bin/python
>>         to point to /etc/alternatives/python, which in turn will point
>>         to /usr/bin/python3.
>>
>>             * sudo update-alternatives --install /usr/bin/python
>>         python /usr/bin/python3 1
>>             * python --version
>>                 should now return 'Python 3.8.2'
>>
>>         That should get the 'python' command pointing to a valid
>>         python installation again. Your next issue might be that some
>>         older python scripts will have to be updated to be compatible
>>         with python3, but fixing those will be a one-time thing and
>>         will get you positioned well for the long term.
>>
>>         -Ross
>>
>>
>>         On 5/11/20 1:58 PM, BabsKy wrote:
>>>         All 'python' commands (tried a few variations) returned
>>>         "command 'python' not found", 
>>>         'python3  --version' returned 'Python 3.8.2'.
>>>         I think it's Gimp python as this has been an issue before, as
>>>         I mentioned, but I don't know what specifically to install,
>>>         it doesn't seem to be 'Gimp python' as it was before.
>>>         I've tinkered with thonny for writing python scripts for Gimp
>>>         and it that it was pygimp but I'm stumped. I don't want to
>>>         randomly install stuff in case I make it worse.  
>>>
>>>         On Mon, 11 May 2020 at 17:58, Ross Mohn
>>>         <rpmohn at waxandwane.org <mailto:rpmohn at waxandwane.org>> wrote:
>>>
>>>             Here are the steps I used:
>>>
>>>              1. Check current system python version is 2.x
>>>                     sudo python --version
>>>              2. Execute this command to switch to python3
>>>                     sudo update-alternatives --install
>>>                 /usr/bin/python python /usr/bin/python3 1
>>>              3. Verify system python version is now 3.x
>>>                     sudo python --version
>>>
>>>             based on steps I found in this post:
>>>                
>>>             https://unix.stackexchange.com/questions/410579/change-the-python3-default-version-in-ubuntu
>>>
>>>             -Ross
>>>
>>>
>>>             On 5/11/20 12:10 PM, BabsKy wrote:
>>>>             I'm surprised that python (for Gimp) isn't installed by
>>>>             default on Linux, that's what's caused this issue before. 
>>>>             I'll try anything to get it working, python plays a
>>>>             large part of my Gimp workflow.
>>>>             Sorry to ask but how would I manually set python3 as the
>>>>             default?  
>>>>
>>>>             On Mon, 11 May 2020 at 16:54, Ross Mohn
>>>>             <rpmohn at waxandwane.org <mailto:rpmohn at waxandwane.org>>
>>>>             wrote:
>>>>
>>>>                 Can you try 'python3'? On a side note, I was
>>>>                 surprised that python3 was note the default in the
>>>>                 upgrade. I had manually set python3 as the default
>>>>                 in my 19.10 and that was switched back to python 2.x
>>>>                 when I upgraded.
>>>>
>>>>                 -Ross
>>>>
>>>>
>>>>                 On 5/11/20 7:38 AM, BabsKy wrote:
>>>>>                 So I did a clean install and Gimp now loads and
>>>>>                 works mostly OK. The issue now is it can't find
>>>>>                 python.
>>>>>                 I know this has been an issue with Gimp on Linux
>>>>>                 previously and it could be solved by 'sudo apt
>>>>>                 install gimp-python', but this doesn't work.
>>>>>
>>>>>                 Output from terminal '/usr/bin/env: ‘python’: No
>>>>>                 such file or directory'
>>>>>                 I can see there's no env in bin.
>>>>>                 Does anyone know how to fix this please?
>>>>>                 I have searched online but the solutions aren't
>>>>>                 relevant to the current Gimp version/Linux.
>>>>>
>>>>>
>>>>
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>>>>
>>>
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>>
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