csg_boltzmann: 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/csg_boltzmann - from package: votca-csg

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

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