orca-dm-wrapper: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/orca-dm-wrapper - from package: gnome-orca

You may install the required package with command apt-get install {package}
Error in other languages:
orca-dm-wrapper: bevel nie gevind nie
orca-dm-wrapper: comandă negăsită
orca-dm-wrapper: comando não encontrado
orca-dm-wrapper: commande introuvable
orca-dm-wrapper: command not found
orca-dm-wrapper: käsku ei ole
orca-dm-wrapper: không tìm thấy lệnh
orca-dm-wrapper: komanda nerasta
orca-dm-wrapper: Kommando nicht gefunden.
orca-dm-wrapper: kommandot finns inte
orca-dm-wrapper: komut yok
orca-dm-wrapper: nie znaleziono polecenia
orca-dm-wrapper: níor aimsíodh an t-ordú
orca-dm-wrapper: no se encontró la orden
orca-dm-wrapper: no s'ha trobat l'ordre
orca-dm-wrapper: opdracht niet gevonden
orca-dm-wrapper: parancs nem található
orca-dm-wrapper: perintah tidak ditemukan
orca-dm-wrapper: príkaz nenájdený
orca-dm-wrapper: příkaz nenalezen
orca-dm-wrapper: команда не найдена
orca-dm-wrapper: командата не е открита
orca-dm-wrapper: 命令找不到
orca-dm-wrapper: コマンドが見つかりません