float.so: 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/float/bin/float.so - from package: gap-float

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