Bug#1029006: bpy: couldn't find 'scripts/modules', blender probably won't start

[Steve Cotton <steve@octalot.at>]

Package: blender-data
Version: 3.4.1+dfsg-1
Severity: grave
Justification: renders package unusable

Blender has no menus, and the only reaction to mouse-movement or keypresses is
an "WM_keymap_poll: empty keymap" error to stdout/stderr. The logs to
stdout/stderr start with:

    $ blender
    bpy: couldn't find 'scripts/modules', blender probably won't start.
    Freestyle: couldn't find 'scripts/freestyle/modules', Freestyle won't work properly.
    ModuleNotFoundError: No module named 'bpy_types'
    ModuleNotFoundError: No module named 'bpy_types'

It seems a lot of directories that 3.3.1 put in /u/s/b/scripts have
ended up down a level in /u/s/b/scripts/scripts instead:

    /usr/share/blender/scripts:
    drwxr-xr-x 3 root root 4096 Jan 16 15:05 addons
    drwxr-xr-x 9 root root 4096 Jan 16 15:05 scripts

    /usr/share/blender/scripts/scripts:
    drwxr-xr-x 64 root root 4096 Jan 16 15:05 addons
    drwxr-xr-x  4 root root 4096 Jan 16 15:05 freestyle
    drwxr-xr-x 12 root root 4096 Jan 16 15:05 modules
    drwxr-xr-x 19 root root 4096 Jan 16 15:05 presets
    drwxr-xr-x  5 root root 4096 Jan 16 15:05 startup
    drwxr-xr-x  2 root root 4096 Jan 16 15:05 templates_osl
    drwxr-xr-x  2 root root 4096 Jan 16 15:05 templates_py

Symlinking the directories up a level didn't fix everything (I didn't resolve
the two "addons" directories), but was enough to show the menus and react to
input.

-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'stable')
merged-usr: no
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.1.0-1-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=de_AT.UTF-8, LC_CTYPE=de_AT.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages blender-data depends on:
ii  python3  3.11.1-1

blender-data recommends no packages.

blender-data suggests no packages.

-- no debconf information