acdcheck: 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/acdcheck - from package: emboss-explorer

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

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