spacegroup: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/spacegroup - from package: elk-lapw

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