predictprotein: 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/predictprotein - from package: predictprotein

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

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