iceca: 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/bin/iceca - from package: libicessl35

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

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