gnome-orca
é o nome do pacote.
$ dpkg -l '*orca*'
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Description
+++-===================-===================-===========================
un gnome-orca <none> (no description available)
un gnome-orca-common <none> (no description available)