check-symbols: 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/check-symbols - from package: ubuntu-dev-tools

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

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