update-cmigemo-dict: 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/sbin/update-cmigemo-dict - from package: cmigemo-common

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