capify: 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/bin/capify - from package: capistrano

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