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

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