This issue is due to an upstream (erroneous) change in libpeas 1.24.
The only reference to python loader is at https://github.com/mate-
desktop/pluma/blob/1.22/pluma/pluma-plugins-engine.c#L63
```
pluma/pluma-plugins-engine.c:63
peas_engine_enable_loader (PEAS_ENGINE (engine), "python");
```
Looking at the blibpeas code here's that function:
https://github.com/GNOME/libpeas/blob/master/libpeas/peas-engine.c#L943
```
libpeas/peas-engine.c:943
* peas_engine_enable_loader:
```
It still references `python` as Python 2 loader and then it calls
peas_utils_get_loader_id to get loader id by name
https://github.com/GNOME/libpeas/blob/master/libpeas/peas-utils.c#L257
```
libpeas/peas-utils.c:257
peas_utils_get_loader_id (const gchar *loader)
```
That function looks at all_plugin_loaders array with all known loaders
names
```
static const gchar *all_plugin_loaders[] = {
"c", "lua5.1", "python", "python3"
};
```
The Python 2 loader is still named `python` this means, if we change python
loader name to python2 in Pluma, libpeas won't find it.

This is where the loader library name was changed without changing the loader
name in the list of loaders:
https://github.com/GNOME/libpeas/commit/dabb83a2e217694220a55c2019a081365a4a1288#diff-ad34de593e22ad307274456f3b4724a3
After that, they dropped autotools build files where you can see that the
library was called libpythonloader in the makefile:
https://github.com/GNOME/libpeas/commit/eadd10dbdd5b9b6b0488aeb41d4bf1592ba9d5d2#diff-f2abb793309b0ed9d8e63c1e038b1e31

Here is a test case:
```
#include <libpeas/peas-engine.h>
int
main (int argc, char **argv) {
PeasEngine *engine = peas_engine_get_default ();
peas_engine_enable_loader (engine, "python2");
return 0;
}
```
Build the above with:
```
gcc -Wall -o peas-test peas-test.c `pkg-config --cflags libpeas-1.0`
`pkg-config --libs libpeas-1.0`
```
And run it:
```
$ ./peas-test
```
You'll get this output:
```
(process:13201): libpeas-WARNING **: 13:25:09.920: Failed to enable unknown
plugin loader 'python2'
```
And with that, we can confirm that the `python2` loader won't be found
by libpeas and that the debdiff above is the correct way to fix this
issue.
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to libpeas in Ubuntu.
https://bugs.launchpad.net/bugs/1846890
Title:
Pluma: unable to enable plugins External tools, Python Console, Quick
Open, Snippets) because of missed /usr/lib/x86_64-linux-
gnu/libpeas-1.0/loaders/libpythonloader.so
Status in libpeas package in Ubuntu:
Confirmed
Bug description:
Steps to reproduce:
1. Install Ubuntu 19.10
2. Launch Pluma
3. Go to Edit -> Preferences, switch to Plugins tab
4. Try enable all plugins by checking their checkmarks
Expected results:
* all plugins are enabled without errors or warnings;
Actual results:
* plugin(s) are not enabled, show the following errors in `pluma`'s terminal:
```
$ pluma
(pluma:1685): libpeas-WARNING **: 19:20:59.204: Failed to load module
'pythonloader': /usr/lib/x86_64-linux-
gnu/libpeas-1.0/loaders/libpythonloader.so: cannot open shared object
file: No such file or directory
(pluma:1685): libpeas-WARNING **: 19:20:59.205: Could not load plugin loader
'python'
```
Note: in previous releases the `libpythonloader.so` was located in
libpeas-1.0-python2loader package (see
https://packages.ubuntu.com/search?suite=disco&arch=amd64&mode=exactfilename&searchon=contents&keywords=libpythonloader.so
) but this file is missed in 19.10 repository.
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: pluma 1.22.2-0ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
Uname: Linux 5.3.0-13-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu7
Architecture: amd64
CurrentDesktop: MATE
Date: Sat Oct 5 19:23:02 2019
InstallationDate: Installed on 2019-10-05 (0 days ago)
InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Beta amd64 (20191004)
SourcePackage: pluma
UpgradeStatus: No upgrade log present (probably fresh install)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libpeas/+bug/1846890/+subscriptions
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