helix2solv: 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/helix2solv - from package: libsolv-tools

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

Error in other languages:
helix2solv: bevel nie gevind nie
helix2solv: comandă negăsită
helix2solv: comando não encontrado
helix2solv: commande introuvable
helix2solv: command not found
helix2solv: käsku ei ole
helix2solv: không tìm thấy lệnh
helix2solv: komanda nerasta
helix2solv: Kommando nicht gefunden.
helix2solv: kommandot finns inte
helix2solv: komut yok
helix2solv: nie znaleziono polecenia
helix2solv: níor aimsíodh an t-ordú
helix2solv: no se encontró la orden
helix2solv: no s'ha trobat l'ordre
helix2solv: opdracht niet gevonden
helix2solv: parancs nem található
helix2solv: perintah tidak ditemukan
helix2solv: príkaz nenájdený
helix2solv: příkaz nenalezen
helix2solv: команда не найдена
helix2solv: командата не е открита
helix2solv: 命令找不到
helix2solv: コマンドが見つかりません