science-social: 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/science-social - from package: science-social

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

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