apertium-desodt: 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
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

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/apertium-desodt - from package: apertium

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