update-skkdic: command not found

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/sbin/update-skkdic - from package: skktools

You may install the required package with command apt-get install {package}

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