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.
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Bugs, which is subscribed to 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
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