At-SPI not started [mate]

[Sebastian Humenda <shumenda@gmx.de>]

Hi

After an update, at-spi is not started automatically anymore. This leads to an
inaccessible mate session. Launching `orca -r` gives:

```
** (orca:7169): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-TU92PCmRzt: Verbindungsaufbau abgelehnt

** (orca:7169): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-TU92PCmRzt: Verbindungsaufbau abgelehnt

** (orca:7169): ERROR **: AT-SPI: Couldn't connect to accessibility bus. Is at-spi-bus-launcher running?
zsh: trace trap  orca -r
```

How can I properly invoke /usr/lib/at-spi2-core/at-spi-bus-launcher and against
which package do I need to file a bug report?

Thanks
Sebastian
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