compgrp: 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/lib/x86_64-linux-gnu/gap/pkg/guava/bin/leon/compgrp - from package: gap-guava-bin

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

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